re: the future....
Relinquish all power to the UN or to the Iraqis themselves.
Will there be civil war or an Islamist state? Most likely;
But it would be among themselves and without Saddam, which seems to have been the main reason for the war (getting rid of him).
Of course, the new regime won't be friendly to the US.
But eventually, it will become friendly again as it will be its own interest. But not very soon.
Raoul