I think it was Jon Steward (Daily Show) that first floated the idea, but ... if Iraq does descend into total anarchy (as opposed to 90% anarchy it's been in since Sadaam was booted), will the U.S. be forced to pull it's soldiers out?
Personally, I don't think so. George is intent on seeing it through until it's a nice and peaceful democracy. Of course, unless he lives to 164, he'll never see it.
But in total civil war, the body count will get a LOT higher than it is now, the pressure will increase to get the soldiers/targets out and if he caves in ...
Just food for thought.