Well, in 2 years or less Chinese mining operations will be underway for the vast mineral deposits there, worth an estimates $2-3 trillion. They'll be using local labor, including children, at near slave wages. If not just outright rented slaves from the Taliban gov. Other reasons why we were sticking around is the problem that Pakistan has nukes, Taliban and AQ in their gov and a hatred of the US and our allies, especially India. Poppy fields will be kicked into high gear to produce even more heroin for global black markets. Not to mention it isn't a bad spot for listening posts to pick up comms and intel between Russia and China.