the christian right will turn on him once they know for certain they cannot win the election. then they will move with their "morals". there's still so much hope that wikileaks or someone can drop something meaningful on clinton that they aren't giving up yet.
They may have overplayed their hand this election though, hard for them not to come out looking like frauds after this regardless of what they do from here on out. Catholic church will survive ($$, tradition, global political power), but evangelicals may be done as a cohesive force. I mean, same group of people will eventually find their way back to each other again, but their may be a bit of a vacuum there after this election. I know several people who've become straight up atheists during this election, these people were dedicated religious folk as well. Some people are doubling down on Trump, but some are having an existential crisis because of the church's relationship to his candidacy. Like you said, they're keeping it together until the election, but there are some hard conversations to be had after he loses. There will be quite a bit of fallout.