[blunt & crude answer]
About the only thing we
can do is wait for the dust of the civil war to settle. The UN won't go in to fix things, it's too risky. If the place is cut up into sectors, we'll be dealing with the Gaza Strip tenfold. Right now, the elected officials already feel like they're under someone elses leadership because they can't agree on anything.
Plus the people in the streets feel like their country is occupied by US forces. It's all a HUGE mess. Probably the
best thing (for the US anyhow) to do right now is slowly step out the back door while trying to convince the UN to go in. It will still be a mess and get messier, but we'd free up enough of our military so we can actually protect ourselves should something happen. Plus I think our boys and girls (and America in general) would feel better if we were hunting Osama rather than acting as rent-a-cops. Right now if something happened we'd be in a draft situation and
really be screwed. We can't train Iraqi's in 2 years, yet we'd be training our own kids in 30 days

The oil contracts are a mess too. Each group is fighting for "control" of it (another reason why dividing it up wouldn't work). Whoever calls the shots for oil, calls the shots for the country. Whichever group gains control of it will be undersiege from the others. That's why I think civil war is imminent.
[/blunt & crude answer]