P.S. Pence is the favorite to succeed Trump and should unite the GOP behind him. Just wait. 
Agree with 80% of what you said, but Pence is the wrong person. His schtick is being really socially conservative; economically speaking he's fairly establishment. To move that direction GOP needs a Keynesian who can go the socially-conservative route without alienating Hispanics or African-Americans as much as Trump has (both relatively socially conservative groups who vote D simply because of endless and unnecessary dog-whistling from the GOP). Can't think of any major figure who fits that bill though.
You can't just have a GOP with zero regard for the business community, the well-off, budget hawks and other economically right-of-center folks. The "Establishment" (to the extent that means anything) certainly made a mistake thinking they only needed people exactly like them to win; the "Trumpists" (again, to the extent that means anything coherent post-Trump) shouldn't make the same mistake. As NC Yankee has said, the future of a winning GOP involves an economically moderate party that is much more socially tolerant than the current Republican Party, one that neither repulses voters that have supported the party for a long time (like Trump has done to many Republicans) nor makes swathes of Americans feel "too poor" to vote Republican (as Romney somewhat did). We need a big tent.
Agree in principle but it's not the way the party is moving. I think the state of the GOP tax plan is proof that there are very few 'economic moderates' left there; the WWC-types are beginning to realize that the R establishment isn't doing anything for them. For what you describe to come about, the GOP would have to eject both its economic-right and social-right extremists in order to rebuild an old coalition, rather than ejecting just the former to build a new one. It's happening anyways, just look at Republican favorability of Ryan and McConnell over the last few years.
