At an Air Force conference near Washington DC this week, Air Force Gen. Mike Hostage claimed "Predators and Reapers are useless in a contested environment," and emphasized a need for the Air Force to move away from the iconic drones that came to symbolize the war in Afghanistan. Hostage specifically cited the anti-air weapons of China and Iran, and went further, noting "the smallest, weakest country with the most minimal air force ... can deal with a Predator." 

He's not wrong, but drones were never supposed to be invulnerable. They were supposed to fly where vulnerability didn't matter much.