Midterms are coming up next year. If they are afraid their association with Trump might take them down, they'll crack.

Honestly I suspect fear of Trump is really their only motivation right now.

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So long as most of these states have party primaries, particularly closed party primaries, it doesn't really matter because anyone insufficiently pro-Trump is getting primaried hard.

They still have to face competition in the general though. If Republican voters are disgusted enough, they might vote for a Democrat, but they are more likely to stay home and just not vote. Which could be enough for them to lose their seats.

> If Republican voters are disgusted enough

If Republican voters were capable of being disgusted enough, it would have happened by now.