Regime change in Iran will be a tough lift

Washington Post: "Intel report warns large-scale war ‘unlikely’ to oust Iran’s regime - A classified U.S. report doubts that Iran’s opposition would take power following either a short or extended U.S. military campaign."

A classified report by the National Intelligence Council found that even a large-scale assault on Iran launched by the United States would be unlikely to oust the Islamic republic’s entrenched military and clerical establishment, a sobering assessment as the Trump administration raises the specter of an extended military campaign that officials say has “only just begun.”

The findings, confirmed to The Washington Post by three people familiar with the report’s contents, raise doubts about President Donald Trump’s declared plan to “clean out” Iran’s leadership structure and install a ruler of his choosing.

The U.S. is not putting boots on the ground and I doubt the Kurds have the firepower to take Tehran.  It's really on the people of Iran but, as the story notes, the opposition is fragmented.