I think I'm going to just wait and see what sort of platform he does do.
I don't see him making any issue of gun control at the national level. And, depending perhaps on the next appointment to the court it will probably be irrelevant what the next President thinks about abortion. In fact, its already pretty much irrelevant.
But it makes a big difference what sort of platform he puts together. If he plays his hand carefully with some moves to the right-- then the White House is his for the taking. Nobody would beat him.
Mrs. Clinton will. RG is the one candidate the Republicans could run that would Guarantee Clinton redux.