This is a very naive view. Things do not happen like that, especially in the Middle East, where killing a tinpot dictator just causes two more radical ones spring to usurp his place. We've been over this where US military interventions in this century alone caused ISIS to spread like wildfire, and make things worse long term in many of the countries affected.

I think some Iranians, perhaps even a vast majority of them, would like freedom from Khomenei, but the westerners have just conducted massive bombing operations, killing many innocent civilians at the behest of their mortal enemy Israel, so any freedom movements are at the very least very unpopular now, with people becoming radicalized by deaths of their loved ones, especially their children, pushing them into the arms of those in power, who can justifiably point and say "see? They are the enemy, not us!". One almost wonders if that wasn't also one of the goals of the invasion, preventing the formation of a secularized and stable Iran.