I've been seeing articles and hearing news folks claiming that McConnell actually has the votes to remove Trump if he decides to go that route. I'm highly skeptical of this, but I will admit that if the Republicans turn on Trump, even at this late hour, they are going to have a pretty strong talking point that they took the high road, demonstrated that they could put aside partisanship, put country over party... on-and-on etc. They are also going to use it as an absolute defense against the claim that they are the party of Trump going forward.
Of course, I'm not convinced that any of this would be fair or accurate, but I am damn sure that they are going to claim it, and a lot of people are going to buy it. There's no denying that ousting their own party's POTUS when they have the majority would be an unprecedented display of bipartisanship. So maybe they (McConnell) wants to grab that brass ring while its there?