[scythe]

I would expect that the end of the current Iranian regime brings about a heavily military-influenced fake democracy that structurally resembles the current government of Pakistan.

The clerics are a paper tiger. Their domestic support base has been almost fully eroded. The Islamic Revolution had proclaimed the hijab as a cause célèbre; today, Iranians generally ignore it when the government isn't looking, after decades of protest and suppression.

But the Iranian military controls a vast amount of the country's economy (by comparison to normal countries) and retains popular support as an opponent of the West. It won't go quietly, and Israel lacks the resources and the United States lacks the will to dismantle it, which anyway would be a Herculean undertaking and cost millions of innocent lives. Military dictatorships are usually pragmatic on social issues, economically protectionist, and politically repressive — making the hypothetical new Iran look more like China's ideal ally than America's.

The most likely vector of regime change is a military coup that produces a government which sues for peace. They may agree to dismantle the nuclear program, but there will be a sense of "for now", and they will cultivate alliances with an eye to protection from the West. We may then see real nuclear weapons in Iran, but with red flags and yellow stars on them, instead of the imaginary nuclear weapons that were invented to keep Bibi out of prison.