If the lobby doesn’t fill up, then the fire team should get AI companions. All they need to do is stay close, watch out for AI and Predator, and one needs to pickup the players that get downed while the others guard that action. Going into a match with a 3 member fire team is a death sentence.
Of course, down the line it would be great to have full AI teams that can hit objectives (to play against while being predator) and to have a Predator AI.