While impeachment at this point seems like a long shot, it would be worth the effort if it can deprive Tr*mp of his post-presidential retirement benefits, including a million bucks a year in travel expenses (and half-a-million more for Melania), lifetime Secret Service protection, and a pension equal to the salary of a Cabinet official. Fittingly, he won't get lifetime health insurance, which only kicks in after five years of Federal employment. I can't object if he's signed up for Medicare.
Meanwhile, it looks like the Republican Party is fracturing, which is not necessarily good news for progressives. If there is "bipartisan cooperation" between Republican and Democratic "moderates," the Senate may as well elect Joe Manchin the new Majority Leader. Granted, even that would be better than having McConnell in charge.
As for Tr*mp's "base," it will survive, albeit somewhat diminished. Just how diminished remains to be seen: those who get their "news" from One America Network, Parler, and 4chan, or who live in communities where Romney is seen as a liberal, can cling to their alternative realities for a long time. (FOX will follow the eyeballs and the ad revenue.)
Needless to say, Biden's FBI will have to pay a lot more attention to domestic terrorism.