All the NeverTrumpers I've seen in my circles are rather committed to going to the polls to vote for down-ballot races, and they encourage others to do the same. They might vote for Johnson as the only exception to a straight GOP ticket.
Let's pray we don't lose the Republican congress to counter balance the extremes of a Hillary executive branch. The 94 midterm elections yanked the Clintons from extreme left policies during the rest of their presidency and it's the only chance we have now to have some semblance of a buffer against their extremes this time around.
I don't think there is any way that the GOP loses the House. The main issue with the Senate is confirmation of nominees and appointees, most significantly SCOTUS.
The House can block legislation, but it can't do a thing about judicial nominees. That's up to the Senate, per the Constitution, so there's no way around it.
Note I wrote "some semblance of a buffer". Note I wrote "I keep hoping that this 'Trump revolution [revolt]' would serve as a serious wake-up call for the Republicans".
It only matters for primaries, and that's going to depend on the next election cycle. If a Senator isn't up for election until 2022, that's a long time to wait this whole thing out to see where the water gathers.
And if a Senator is running in a competitive race against a Democrat, they're likely distancing themselves from Trump and may lose anyway.
IMO, if Jim Gray [D] intends to use the issue of gun control here in KY to unseat Rand Paul he is making a fatal mistake. Though Gray has been good for Lexington as Mayor I think Paul is expected to win senate race easily.
It would take some serious momentum shifts, but it is possible, albeit unlikely. Clinton probably has another scandal or two up her sleeve. Whether they will stick is another question.
Trump's scandals are more tabloid scandals because he hasn't been in government. It's not government corruption if you are a private citizen (unless you bribe or something).
The best chance to keep liberal justices off of SCOTUS is for the GOP to keep the Senate. A Trump win would cement it, but that's far from assured.