What remains of the NeverTrump position in political hinges crucially on a Clinton presidency, I suspect. Clinton, for as much as she's dived to the left, essentially remains a big business neo-con hawk, which is why the GOPe has found it so easy to promote talk of a third party run. Sinking Trump and gaining Clinton? Not the most perfect world, but for them, it's better than a Trump world.
I suspect the prospect of a Trump v Sanders race would introduce new levels of panic into the party. All that talk of voting for principle, even if it meant a Hillary victory, would go up in flames at the prospect of a presidency with full-blown socialist dove, cuck or not.