ADG, for once, you actually make some sense in what you say. It's very possible that the Taliban would have hauled out the body of this guy, and said "we give". But also remember, the Taliban are incredibly power-hungry, and in their own warped way, they may just want to continue this war to try and lure the Americans into their country to try to make them fight a massed campaign the way the Soviets did in the 1980's.
Fortunately, the US has learned that how the USSR fought there doesn't work. They've learned that lesson.
And as for the "Weekend At Bernies" reference, I had to chuckle, with the thought of a few Al-Quaeda members walking around, on each side of Osama in the same fashion.