Then drones will eventually be hardened, use frequency-hopping or burst communication, have longer range optic capabilities, fly at higher altitudes and be stealthier, etc etc. They'll be fixed up to drop remote transmitters, drop cameras into nearby trees and onto nearby buildings, and lots of other tricks.
I'm not sure the authorities can win this one (although I'm sure they'll try).
+1. Also I wouldn't consider it a stretch to believe including anti-jamming to be the next stretch target for the groups producing the solutions to the existing struggles with conflicting signals with multiple flyers in the air. I see this as effectively the same problem caused by less sophisticated radio signals. Side note, I'm doubtful whether jamming a GPS would allow most devices to fly home as stated, as I believe most devices fly-home via GPS unless there's some sort of visual indicator of their destination (infrared lit landing pad or something) and would probably just cause most common drones to hover as though out of range, Gyros and pre-programmed safety instructions taking control.
The solution of this problem is trivial and is left as an exercise for the reader.