Maybe some future school shooter wannabe will notice that they barely even report on school shootings anymore, and Uvalde even reelected the piece of shit sheriff that let all those kids die. Maybe they will see this shooter being treated like some kind of hero, and decide to hunt Billionaires or CEOs instead.
After enough of those, the world will be drastically improved, or the surviving billionaires will finally bring about some real gun control legislation.
The amount of weight a drone can carry is pretty limited. And the low tech easily made at home explosives are fairly heavy.
However, even if it was viable, the 1% will have everything right down to paper airplanes made illegal.