This is a good point…for four years Trump has gotten away with maybe 100 things (maybe more?) that would have sunk any other politician’s career, but for whatever reason he’s able to get away with them. A large part of it is his base, which has the Republican party cowed, so they just follow along…and that’s not going to change no matter what impeachment finds, they have cut themselves off from any facts about Trump so his bad dealings will be ignored, called lies by “the deep state and left wing media”, or explained away as just fine (unless a Democrat did it of course).
Trump really has no reason to believe that impeachment will turn out any different, that he will finally be held responsible…even when he’s been held responsible in his life it’s been a minor sting that he could wave away (the Trump charity fine this week is just one more example). He still has his base behind him, they are still keeping the Republicans in line, and it’s extremely unlikely that anything in the impeachment process will change that. Really, the 2020 election is going to end up as the only chance to hold him accountable for what he has done.