Leaving Afghanistan will make it difficult to whack al Qaeda with Hellfires
The US best hope is to wait out Karzai and cut a deal with a more reasonable replacement. That may mean altering the current schedule of withdrawals, but that beats making ourselves hostage to the whims of Karzai. I think it is inevitable that we will lose the ability to strike with drones if we leave without a deal, and unfortunately, Obama has already shown he was willing to make such rash retreats in Iraq.
American intelligence agencies are concerned that they could lose their air bases used for drone strikes if a final security deal cannot be struck with the Afghan president, Hamid Karzai.