It likely wouldn't be kinetic, but nukes didn't stop us from chipping away at the Soviet Union.

I could be wrong, but I don't buy the public story that this is about regime change. You don't topple a government with air superiority alone, and you don't do it in a matter of days. I also don't expect the US would be okay letting the Iranian people pick who comes next. We have a history of installing puppets and that similarly doesn't happen only via bombing runs.