I would make the same wager.
Trump is finished. Had he not been so "off the wall", he may have had a chance at a comeback. However, despite the fortune I made while he was in office, I would not vote for him again. He's simply too unstable. There are many like me.
The best thing he could do is try to influence his voters to back the GOP nominee with the condition that Trump be given a cabinet post in a new administration.