Many even want the US to over throw their government.
Sounds like what we were told about the Iraqis in addition to the notion that they would all be dancing in the streets. Even with Saddam sitting in a jail, there are still a lot of them that want to blow us up.
I'd prefer the Iranians overthrow their own government. Last time the US was involved in Iranian internal affairs (when it was a secular country and Iranians enjoyed far more freedoms than today), they took American hostages and we got to listen to them here at home in our streets and campuses shouting "death to America" until our government finally sent them packing. I know because I had to walk past them wearing their hoods shouting how much they hated my country and countrymen and wanted us all dead. I didn't understand why I had to be subjected daily to that kind of hatred and threats from a group of non-citizens in my own home (I worked on a major university campus). I suspect there are a lot of Americans that also still remember those "death to USA" marches.
My guess is the Iranians will NOT overthrow their government.