A classified US report from the National Intelligence Council (NIC) doubts that Iran's opposition would take power following either a short or extended US and Israeli military campaign against the people of Iran.
Iran regime change advocates got what they spent decades pushing for--the US to launch a big war to collapse Iran's government--and they're still not happy.
Because what they pushed for years was a fantasy of a smooth, easy regime change war that gets everyone to tell them they were right all along.