A number of commentators have mentioned that because even the Shiites didn't get a majority, there will have to be a certain amount of good, old-fashioned horse-trading. If the Iraqis can manage that -- as opposed to good, old-fashioned murdering other factions -- they have a fair chance. (Hoping and praying!)
Well put. I've wondered from early in the process whether it might not have been preferable to have created three separate republics: Kurd, Sunni and Shiite, or perhaps a loose federation among the three. I'm concerned that we could be attempting to create another Yugoslavia that is destined to spin apart eventually. In the meantime, I'll hope for the best, along the lines you describe.