Awwwwww.
I'm 99.9% sure he's a goner. The only wildcard is if he's holding out to make a televised appearance after the next big terror attack on the U.S. This scenario is highly unlikely at this point. His patience is only outdone by his perverse megalomania.
I'm thinking the cave thing, too. There's a good chance he found a pocket of air, where he slowly realized "those Western Devils are the real deal - they will not stop until Al-Queda is castrated! What have I done? I could be living large with my $$$ on the French Riviera! And Allah was created in the mind of a a manic-depressive pedophile named Mohammed! No......" [SLUMP]