Drone wars, not
Interesting that anti-drone technologies are evolving. Missiles tend to cost more than the drone they shoot down, a win-win for the drone operator. If Russian bragging is to be believed, ground gunfire and cyber attack have both proved effective. The problem with drone-on-drone is the one Britain had with the air war in 1939 - getting enough defenders to the battle zone before the attackers have done their stuff and effed off.
If I were an armaments company, I'd be building hi-res sensors and AI into my anti-aircraft gunnery systems right now.