Precisely the same thing that will happen anyway.
Exactly.
Unless the US sucks up to Syria and Iran and engages them constructively in a political outcome.
Gonna be chaos no matter what, and the longer the US sticks around the bigger mess it will be. Gotta get out before it drifts into way with Iran, too.
It's a bit like putting off an operation. The longer it's postponed, the worse it's gonna be.
Arf