Yes, the killing of Supreme Leader Ali Khamenei was a historic and violent shock. No, it did not automatically cause the regime to fall apart like a stack of cards. That would be satisfying, but it would also be a rushed, wishful take.

Built-in survival

The Islamic Republic was designed with the possibility of a leadership vacancy in mind. Article 111 of the constitution says a temporary council takes over when the leader’s office is empty, and the Assembly of Experts then picks a new leader as soon as possible.

After the announcement of Khamenei’s death, power moved to a temporary three-person council: President Masoud Pezeshkian, judiciary chief Gholam-Hossein Mohseni-Ejei, and Guardian Council member Alireza Arafi. The Assembly of Experts, which has 88 members, is responsible for naming the next supreme leader.

This is not just paperwork. It is a survival protocol that gives the state a clear procedure in a moment of maximum shock.

Where the real power sits

Constitutional text matters, but the balance of power inside the system matters more. The regime draws strength from three main layers:

  • Religious legitimacy, including the office of the Supreme Leader, the Assembly of Experts, and the Guardian Council, which together decide who gets the official seal of authority.
  • Security and military power, primarily the Islamic Revolutionary Guard Corps, which acts as the backbone of the system rather than a routine military arm.
  • Political and bureaucratic machinery, meaning the presidency, judiciary, ministries, and economic networks that keep daily state functions running.

One layer matters most

Of these, the Islamic Revolutionary Guard Corps, the IRGC, is decisive. It is not under the president in a normal way. It controls internal security, regional strategy, and major economic and influence networks. After the killing of senior commanders and the current wartime pressures, the IRGC has tightened operational control and relies on decentralized mid-level leadership so things keep moving even when shock hits the top.

Put simply, the head may have been struck, but many of the limbs keep working.

Why collapse is unlikely in the short term

Several signs point away from immediate disintegration. Ideological regimes facing external existential threats often harden and close ranks rather than fall apart. Some Iranian opposition figures outside the country have also acknowledged that military strikes alone rarely topple an entrenched political system; deep internal dynamics are required for genuine change.

On the other hand, survival in the short term does not equal safety or normalcy. The most likely path forward, based on current indications, is that the regime endures but becomes more rigid and security-focused.

What a hardened regime looks like

Expect several likely shifts:

  • Greater reliance on the IRGC. The security corps will have more influence over politics and policy.
  • Narrower political space. Authorities will treat opponents and critics as security risks, reducing room for debate and dissent.
  • Internal suspicion and consolidation. The leadership will prefer defensive measures and tighter control, especially after moves like the reported selection of Mojtaba Khamenei, the late leader’s son.

Signs of anxiety, not collapse

There are already strains inside the ruling elite. Tensions have surfaced between hardliners aligned with the IRGC and a less hardline current connected with President Pezeshkian, particularly after his controversial comments about stopping attacks on Gulf states. Some hardline clerics pushed to speed up the choice of a new supreme leader, showing discomfort with power being temporarily spread across a three-person council during war.

These are signs of stress and fear, not necessarily a terminal breakdown. The real test is whether institutions stay cohesive under pressure, especially the IRGC.

The takeaway

The killing of the supreme leader is a major shock, but it did not automatically abolish the system. A constitutional mechanism exists, and the IRGC’s structural strength gives the regime resilience. That resilience, though, comes at a cost: less flexibility, more security control, and a regime that may survive by becoming more closed and exhausted.

So the paradox is this: the regime has not fallen, but it is entering a phase of anxious rigidity. That rigidity can protect it now and weaken it later.