The more complex the better. Far cry 6- which is coming out soon if rumors are right, is building on the AI of the game. Even with a system like from far cry 5, would be great. Improving on it would be better. But for best scenerio, doing turf wars- like MHW did would be cool.
I dont see it as a hard thing to implement. Just takes a few people who will desginated work on AI. Which is rare for ubisoft, since AI has not changed much since AC 3