Expand the GOP? It would be great that he did - it would be evidence of a successful Presidency. I didn't vote for him, and the reasons I couldn't haven't been resolved, but I want him to succeed.
I think he may partner with Paul Ryan on the domestic side and be a maverick on foreign policy. That formula has a chance to succeed, although there's absolutely no need for Trump to be reckless. Except that he likes to be reckless.