The principal goal that Osama bin Laden had in mind, in perpetrating the crimes of 9/11, was to lure America into an extended, interminable quagmire of attrition in the "land where empires go to die." While this may seem a bold statement that cannot be proved, it is consistent with three major facts:
1) American had to react. It was predictable where we would have to strike.
2) Osama's salad days were spent humbling one superpower in the same mountains.
3) If you were a foe of the United States, you would study which past errors almost destroyed America. Those two were Civil War and a land war of attrition in Asia. (In fact, since 9/11, it appears we've been rapidly plunged into both.)