Don, I will say this.
As soon as the new government is formed, it is time to start to schedule withdrawal. The new government must be responsible for its own security. We should gradually move back to a few secure bases, in Iraq and elsewhere, from which we can provide firepower on demand to the Iraqi forces. Then the ball will be in the new Iraqi government's court. So long as they know that they can depend upon us, they will not be motivated to get their own act together.