Ditto, either way the Sunnis (main antagonists) would lose and the US would win. The Sunnis treat the Shiites the way Imperial Japan treated the Koreans. They are lucky that they have not been butchered in the streets shortly after Saddam's fall. The minority Sunnis have two choices, give up their dreams of regaining power or face annihilation at the hands of the majority Iraqis. The US should signal to the Sunnis that we can play it either way.
Outstanding rebuttal by a light colonel on the ground in Baghdad.
Only Al-Quaeda, Iran or radical Shiites like Al-Sadr would benefit from a civil war. The Sunnis would get creamed and they know it. They don't like it, but they see it.