It'll never happen...ya see, the AF doesn't hire people to be flyers, they hire people to do all the extra duties around the squadron and base. Flying's just what you do when your other duties are complete. If there's no aircrew on base to fly the airplane (because it's robotic), who's gonna be around to plan the airshow, the change of command, set up the picnic, the VIP visit, the ribbon cutting ceremony for the new building, set up the commander's golf tournament, stand at the flagpole Friday afternooon for retreat and pictures, go to Hail and Farewell and laugh during the "amatuer Colonel's comedy hour", cut the grass at the squadron, write articles for the base newspaper, play intramurals and a variety of other things that won't make sense to the non-military (no offense meant...just you wouldn't believe it if you haven't seen it for yourself).
But, do you think there's an Army general out there that's gonna trust the Air Force general with his millions upon millions of dollars of equipment (and maybe people???) to an airplane that's totally remote control? Should be an interesting research and development phase...