

The US has had air supremacy in every conflict it has been in for a long time and it hasn’t won a single one of them. It would topple the Iranian regime with a ground invasion, but air strikes won’t do that. And the US would certainly lose an insurgent war just like it did everywhere else.
Given that the regime has been around for fifty years, I really doubt that killing the head of state would destroy the state. They have a much deeper bench than that I would assume