The SOFA is that thing lurking under the big flat rock.  Everyone knows it's there but no one wants to flip that rock over.
Assuming that a constitution is written and elections under that constitution duly take place--I believe the timetable calls for the vote in December.  OK, then the Iraqis presumably will have a government with the authority to negotiate a Status of Forces Agreement with the US.  Big Problemo: after all the shit that's gone down, nobody in their right mind can imagine any new Iraqi government negotiating anything of the kind. The Iraqis will want the US OUT, period, end of discussion. No bases. No nothing. Just leave, please.
So what happens to all those "permanent" bases we're busy building over there?  Is the US going to just leave?  Or will the US risk a war with all the Iraqis by attempting stay on, SOFA or no SOFA?
Stay fucking tuned...