The Long War: How does the war with Iran end?

Key takeaways:

• • • The US achieved conventional military dominance, but it hasn’t solved the core problem — The navy that was destroyed was never the one controlling the Strait of Hormuz. The asymmetric force that is, the IRGCN, retained 80% of its small-boat fleet and may be able to replenish losses from civilian infrastructure faster than the US can eliminate them.

    • All three pathways to a quick resolution are blocked — The regime has hardened rather than collapsed, the diplomatic positions are nowhere near overlapping, and the US military posture is escalating, including possible ground operations, while allied support remains symbolic.

    • The conflict is likely measured in quarters, not weeks, and the economic difference is not linear — Businesses should be stress-testing against sustained disruption rather than planning for a return to normal, because the conditions required for a rapid resolution would each need to break favorably — and right now, none of them are.

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This is the first of a two-part series on the impact of the war with Iran as the conflict continues. In this part, we look at different ways the war could wind down quickly, and why none of them offer an immediate pathway.

The war with Iran is not going to be over by the end of this week.

That sentence shouldn’t be controversial four weeks into the ongoing war with Iran being waged by the United States and Israel, but it runs against the grain of how markets, policymakers, and many business leaders have been processing this conflict. The dominant assumption, visible in equity markets that have wobbled but not cratered, is that this is an acute shock with a definable end date.

However, very little about the military, political, or strategic picture supports that assumption.

While I make no claim to predict the war’s exact duration, I can lay out why the most likely scenarios point to a conflict measured in quarters, not weeks — and why that difference matters. In the next part of this series, we’ll sketch the economic consequences on a quarter-by-quarter basis, drawing on the latest projections from top economic thinkers. First, however, here is why this war probably drags on.

The wins aren’t winning…

By a surface level scorecard, Operation Epic Fury has been exactly the kind of lopsided success one would expect of a global superpower that’s going up against a regional player. Iran’s Supreme Leader was killed in the opening strikes, Iran’s conventional navy was sunk at anchor before they could sortie, and full air supremacy by the US appears established. If you were grading this on the metrics that won wars in the 20th century, you’d be forgiven for thinking it was nearly over.

Yet it is not nearly over. The Strait of Hormuz remains effectively closed. Daily transits have collapsed from 138 ships to fewer than five. Approximately 2,000 vessels and 20,000 seafarers are stranded in the region with nowhere to go. Brent crude is at $108 per barrel as of March 26, up roughly 50% since the war began. The International Energy Agency has called the current situation the largest disruption to global energy supplies in history.

The disconnect between the military scorecard and the strategic reality comes down to a single, underappreciated fact that the US destroyed the wrong navy. To be fair, it’s not like they had much of a choice. Iran’s conventional fleet had to go, and it went; however, that was playing on easy mode. Iran’s conventional fleet, its frigates, corvettes, and submarines, was a prestige force built for Indian Ocean power projection.

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You can find out more about the geopolitical and economic situation in 2026 here

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The force actually designed to fight America, however, is the Islamic Revolutionary Guard Corps Navy (IRGCN), and it is something else entirely: a dispersed network of hundreds of armed speedboats, coastal missile batteries, thousands of sea mines, drone systems, and midget submarines spread across dozens of small bases along hundreds of miles of Persian Gulf coastline. The IRGCN’s entire doctrine, training, and equipment procurement were optimized for exactly one scenario, that of denying the Strait of Hormuz to a technologically superior adversary. That is the war Iran is now fighting.

Even though the IRGCN lost its most advanced platforms, those were not the workhorses of their fleet. The IRGCN retains an estimated 80% of its small-boat fleet, the fast boats that hide among fishing dhows, the crews that can scatter onshore and remount on surviving craft. The US is tasked with the mission of hunting small boats hiding among civilian vessels, in a fight in which Iran is willing to lose dozens of them a day to keep the Strait closed. This is not a mopping-up operation; rather, it is a war of attrition that the US is not structured to win quickly, and one in which Iran can replace its losses in ways a conventional navy cannot. For the US, it’s like trying to empty a bathtub while the spigot is still running.

Further, the math of the Strait itself is unforgiving. Iran had an estimated 5,000 sea mines before the war and has begun laying them. The US Navy decommissioned its last Gulf-based minesweepers in 2025 — timing that, in hindsight, looks catastrophic.

Indeed, the US can sink every major Iranian warship afloat and still not reopen the waterway. That, in fact, is roughly what has happened.

…And the off-ramps are blocked

If conventional military victory hasn’t solved the problem, there are three other ways this war ends quickly. As of late March, however, all three are jammed.

1. The regime isn’t collapsing

A US intelligence assessment completed before the war concluded that military action was unlikely to produce regime change even if Iran’s leadership was killed. That assessment has proven accurate. Iran’s constitutional succession mechanism activated as designed, and a new Supreme Leader, the previous one’s more hardline son, was installed within days. Also, protests are not sweeping the streets. Ideological regimes under external threat tend to harden, not fracture. Indeed, both the Taliban and Hamas have survived worse. The Iranian Islamic Republic, whatever else you want to say about it, appears to be surviving this conflict as well.

2. Diplomacy has nowhere to go

Iran rejected the 15-point plan offered by the US and published five counterdemands, including recognition of Iranian sovereignty over the Strait of Hormuz, which is a nonstarter for the US. Iran’s foreign minister says Tehran has no intention of negotiating, even as President Donald J. Trump insists talks are continuing. These positions aren’t close to overlapping, and both sides are staking their credibility on not budging first.

And Iran has good reason to believe time is on its side. The war is deeply unpopular in the US and the same affordability anxiety that swept Republicans into power is now threatening to sweep them out in the midterms. Tehran knows for every day the war goes on, they get to roll the dice that Trump will back out, giving them a strong incentive to get as many rolls as they can.

3. The military posture is escalating, not resolving

Ground troops, including paratroopers from the 82nd Airborne, are en route to the Gulf or have received deployment orders. Reports indicate the White House is weighing a seizure of Kharg Island, Iran’s primary oil terminal, an operation that would put American boots on Iranian soil for the first time. Seven allied nations signed a statement supporting Strait security, but it’s a paperwork alliance, lacking the kind of committed hardware needed to force a solution to the Strait’s closure.

What does this mean for business?

The Iranian regime isn’t folding, diplomacy doesn’t seem to be catching on, and the US military posture is expanding. None of the conditions point to a rapid resolution, and in fact, several of them point to a prolonged conflict.

If this war is measured in quarters rather than weeks, the economic consequences stop being a temporary, albeit painful price spike and start being a structural disruptive event, one that reshapes supply chains, reprices risk, and forces companies to make hard choices about where and how they operate. The difference between a three-week war and a three-quarter war is not a difference of magnitude, it is a difference in kind.

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In the concluding part of this series, we’ll walk through what a quarter-by-quarter economic scenario would look like if the war continues.