I'm somewhat reminded of this scene from Angel has Fallen (absolutely terrible movie btw, would not recommend):
https://www.youtube.com/watch?v=pbGxYoxpPdI
But that scene with drones, in hindsight, seems a bit prescient. Perhaps not in the delivery of the drones, but at least in the tactic. As individual drone countermeasures become the norm, I have a feeling we're going to start seeing more "swarming" techniques being used against high value targets. Even a purpose built gun system is going to struggle against 20-50 grenade-sized drones, which each cost $100, all attacking in unison.