The nominee will be chosen in the primaries, not by “the party” in a brokered convention.
The real question is whether Trump would go third party if, a six months or a year from now, he concludes that he’s likely to lose in the primaries against Santos or some other TBD candidate who gets on a roll.
Trump is an out of control ego monster. That’s not going to change. We can do better.
Santos isn’t old enough.