That was ALWAYS going to happen when Saddam was overthrown. Every mideast and near-eastern scholar knew that the only thing that was keeping the Sunni and Shiites from slaughtering each other was a dictator.
The same thing was true in Yugoslavia--look what happened there after Tito.
The only idiots who thought they could instill democracy in Iraq were Bush and Cheney and their gang of neocons.
Funny they would think that, while at the same time dismantling so many aspects of AMERICAN democracy, starting with the Constitution.
I'm a student of the Near East. I don't think the bloodbath will be much worse than what's going on now. But I do think Iraq will be divided into three or four ethnically ruled nations: Sunni-stan, Shiite-stan and Kurdistan. (The 4th would be controlled by Halliburton, let's call it Oil-stan.)
The real bloodbath would be in Kurdistan, which would be savagely attacked and possibly annexed by Turkey.
And, yes, the whole damn thing will be George Bush's fault.