I know this would be VERY hard to do, but maybe there could be a mode that is single player, and predator only, where you hunt in a large area (like a city or something) and just go on a rampage, where as you continue, it gets harder with more armored enemies and stuff.
So basically like a horde mode? And maybe your friends could join the game and help the AI kill predator.
Of course, in this mode the predator would be buffed, and they would have to improve the AI.
So, does this sound like a good idea?