And the hardest part is ensuring the new regime can stay in place. That would suggest boots on the ground for a while ... and a while could be several decades.

And the hardest part is ensuring the new regime can stay in place. That would suggest boots on the ground for a while ... and a while could be several decades. I think the question is whether it would be worth the cost and effort. We still have 28K troops in Korea. I think Iran would require more troops.