I think he is still alive, and probably living under cover in another country, and probably has been since the whole war started. Let's face it, if he was in Afghanistan, he would have been killed long ago, and we might not have ever heard about it, so maybe he is dead? But logic tells me he isn't.
The US army could flatten that whole country in one day with multiple passes with aircrafts. If they really wanted him dead, and wanted to end the Afghanistani threat, it would have ended long ago. But if war was over, how many jobs would be obsolete in the States? Too many to make it profitable for the US Government.