Rather than throw up their hands and concede to Hillary, it has occurred to me that some large chunk of the RP might break off (however temporarily, the way the Dixiecrats or the Southern Democrats of 1860 did) and run their own candidate independent of whatever Rump is left with.
If that were to happen, and they chose a nuts-and-bolts rational candidate (which means John Kasich), and if at the same time the other side used its own "superdelegate" scamming to nominate Hillary, I would seriously consider voting for Kasich.
Perhaps it's time for the RP, at the age of 162 (as of yesterday), to take out the trash like the DP did in 1964 at the age of 136. Let Rince Priebus lament "we have lost the knuckledraggers for a generation".
John Kasich can't be a 3rd party, all the GOP candidates signed a pledge. I think they're considering Rick Perry. If he decides to do it, he will be the sacrificial lamb. They can't block Trump at the convention, that would be a major violent riot. So the only option is to do a 3rd party now, so Republicans can actually have a candidate they can support.
I uh, don't think "signing a pledge" means anything, especially under these circumstances. Certainly doesn't mean he or anyone is constrained to its terms, particularly if they form another party.
As for Rump's threats of violence if he doesn't get his way, BFD. Fear and loathing in whatever form is part of political party schisms. Just ask the Democrats. They have tons of experience.