I think they're giving up on Trump so they can try to protect down-ballot candidates and "save the image" of the party for the next go-around. The only problem is that people are sick of the insider statist RINOs, so protecting that aspect of the party is only going to hurt them (and us) in the long run.
If there's any silver lining to Trump's candidacy, maybe it will be to accelerate the destruction of the current Republican party.
Then there's this. Maybe it won't matter if the GOP ever gets reformed because after Hillary wins, the country will likely be under single-party rule for the next 20+ years.