To be fair, most prominent republicans, when Trump started his attempt to take over the party, denounced him. Lindsey Graham called him a "Kook", who was likely to get us into a war, and lots of other nasty things. Only when Trump gathered in the KKK, white nationalists, and other extremists to make a winning coalition,did they start kissing his ring. I think that if he falls, very few of them will be unhappy.
Suppose there was a left-wing populist, just as narcissistic and incompetent as Trump, but who managed to put together a coalition of antifa, radical leftists and whatever to control the democrat party. Do you not suppose there would be democrats who would submit to him in order to keep their jobs? Of course there would be.
It's just that it happened to the republicans.
Sure, there would be people like Biden,who wouldn't go along with it, just as there were people like McCain and Romney. But even Romney has accommodated a little. And there would be an "FDR project" made up of liberal democrats assailing him, just as conservative republicans have the Lincoln Project, going after Trump.
For the same reasons. Trump isn't a conservative; he's an amoral opportunist, and in the long run, he will have done horrendous damage to the conservative movement. Those of us who are not conservative can feel morally superior, but we'd be kidding ourselves. Someday, there may be a different Trump who devastates the left in the same way that Trump has wrecked the conservative movement.