Let me refer back to a post of over a year ago on this:
If central Iraq becomes a rump Sunni state, I believe that Sunni money would flow into it to keep the Iraqi Sunnis fighting the Shias. The wider Sunni Arab world was happy to let Iraqis die in the Iran-Iraq War to keep the Shia Persians at bay (and all the better that Iraqi Shias largely died doing it). The wider Arab world would be happy to send money and jihadi malcontents from their own countries to keep Iraq's Sunnis fighting the Iraqi Shias for another generation. If the Sunnis have to die for a Sunni Iraq, the rest of the Arab world won't cry one bit. And God knows what the Baathists buried in the deserts of western Iraq or the central Sunni areas. With money, the residual technical knowledge of the Sunnis remaining in the region, and whatever is hidden, death and destruction would flow from the Sunni Triangle.
We can't trust the Iraqi Sunnis alone without adult supervision for at least a generation. Saddam Hussein screwed them up that much.
