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.
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.
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.