Just look at Haley. She had practically all the same stances as trump except "trump can do any crime".
And Biden ran around talking about how we need more republicans like her. Then about how great Mitch McConnell is...
trump is a problem, but he's not the problem. He's a symptom of modern republicans, if trump's while family died in a plane crash tomorrow. They'd be replaced by Monday with people who want the same thing and just less blatant about.
Going back to the day of McConnel and Strom Thurmond like Biden wants wouldn't solve anything except making it harder to get Dems elected, and impossible to get neoliberals elected.