the calculus of damage he's doing vs. the voters who still support him changes.

This could happen after the midterms, particularly if the Democrats take Congress and the Republicans can blame them for getting rid of Trump, with safe seats voting for the removal as well.

But once that calculus does change, we'll know because Fox will suddenly start pushing the view that, regrettably, Trump is a crook and has to go.

Of course, the Republican leadership may never decide that it has changed enough. One hopes their cynicism is enough to get them there eventually, though. If they can come up with a convincing narrative for why Drumpf has to go, I think we'll see President Pence (and there's a whole other problem).

I think we might be better off letting him stay in there with a Congress that blocks his stupidity as much as possible, and then boot him in 2020 without the danger of Pence for 4 years.