"American warfare technologies are capable of making the Iranians outright surrender in a few weeks with little real fighting."
Technologies? Techologies? Come on, this is Iran, the country that fought an 8-year war with Iraq to a stalemate. At the end, they were using children to clear minefields.
What possible grounds are there for thinking that they would be any more formidable than the Iraqis?
True. And, that's before they were decimated in the Persian Gulf I war. Iran wouldn't stand a chance....and they know it. Besides, there wouldn't be much support for an "insurgent" movement in Persian Iran.
Several times the size, population and ruggedness of terrain. Most of our army busy either in Iraq or rotating back to rest. Zero international support with little more domestically.