They should. Thing is, sooner or later they need to learn the hard way that "not being Trump" can take you only so far.
Except that .... they won't. You'd think the GOP would have learned the effect of "being Trump" had on their position in the political landscape ... except that instead of learning from what took all the offices away from them, they doubled down on the same demagoguery.
The Dems won't learn anything either, mostly because the really awful thing about the US system is that it's a duopoly. There's a thorough lack of options which means that "not being the other people" is just good enough to pass the time without doing anything meaningful while crying all the time that "we're not perfect but the others are worse"