David French repeats a little know fact about delegates freedom to choose at the Convention:
Not a Single Republican Delegate Is ‘Bound’ to Donald Trump, by David French, National Review
A political party is its own organization; it can do anything it wants. There ain't nothing legally binding in primary elections -- those are in effect recommendations for who the candidate should be. If the party as a whole decides those recommendations are suicidal, it can (and should) disregard them and nominate whoever it wants to nominate.
Like it did in 1912 when a bloviant from New York, dismissed as an egomaniac by his detractors, swept through a slew of primary wins by large margins. The RP decided he wasn't the ideal choice and ran the Establishment guy from Ohio.
And they'll sign their own death certificate.
At this point it may be a matter of "pick your poison", because with Rump running at the head of the ticket, the Party may as well drink antifreeze.