Is there actually a purpose for NATO to remain in Afganistan? An exit has to occur someday. Is delaying the exit only delaying the clear results, that the current proped-up government will likely fall and the warlords will regain control, and the Taliban will reemerge in some form. Many of the societies (and democracy) gains, will likely be lost regardless (IMO).

Does remaining there serve a useful purpose, alot of cash and lives and civilian deaths. The longer NATO stays, the more likely they will do something to turn many against the west (frequent deaths of civilians). The targeted terrorist groups (the reson for going in) have found many other places to operate from. And, some suspect the only winners are the coffers of the Pakistanis (which may someday be used against the west).

Karzai angered by civilian deaths in NATO airstrike