Might have given them ideas, but these things are more sophisticated than anything we had at that time. These things are multiple-ways sophisticated, but the most frightening thing in the whole picture is the economics of it.
Yep. Swarms of preprogrammed drones can swamp defenses right now. Attacking units are relatively cheap. Defending units must be relatively cheap as well. And they must be very mobile.
A laser weapon capable of engaging targets in rapid sequence might be the answer - something like a Phalanx system but armed with a laser. Cheap ammo. Depending on the effective range of the laser against the drone a handful of them might be enough to defend a city. A microwave weapon might fry the electronics as well.