I personally see AI generated events being good because it just doesn't happen with players, people just stay on there own and shoot everyone on sight and it kinda ruins the game.. And with AI events, i think, it would encourage more people to team up to defeat the AI enemy in the game. Also, the AI soldiers in ArmA aren't that bad, the zombies on the overhand are terrible though. But I do see where you're coming from and yes it isn't an amazing idea, but i still think it would be pretty cool.