I am not seeing him winning in the 3rd fight, not even split decision if it goes to 12 rounds.
If Wilder is smart he will fight others and then build up his resume once again and then call out Fury again, but i am also not expecting anything different if Fury and Wilder are to fight again.
Dude... Wilder lost his title, and the closest opportunity to getting it back is via this rematch. No sane boxer would miss this kind of opportunity, no matter how outclassed they were.
If Wilder loses again in the 3rd fight, I don't think he would wear the "champ" belt for quite some time since Fury would move to the next opponent.