You really didn’t need to write all that.
Trump’s support in the GOP is thin. Every one of them would prefer a President Pence, and all that’s required is a single misstep, not in any particular category as you outline above, but one which noticeably decreases support in his core constituency.
If that happens, he’s toast.
But, it’s also possible that he succeeds in governance, and grows his support. Get popcorn. It’s going to be interesting.