The whole situation is so bizarre. The rift between the establishment GOP, who just wants to return to the god ol' days of the Bush era, and Trump, isn't even really about policy or ideology – after all, Trump may have started out as an anti-establishment populist, but he quickly adopted the GOP's platform during his term. This is almost entirely about Trump as a person. So if McConnell wants to purge 'Trumpism', what exactly does he mean? At this point Trumpism is just Bush-era GOP wankery mixed with lots of bloviating and theater.
On the other hand, smart people on the right like Tucker, who were actually sympathetic to Trump's 2016 platform, but became critical of his governing style or this whole 'stop the steal' grift, were attacked by part of Trump's base for their disloyalty or as being controlled opposition, despite the fact that people like Tucker actually care about populist policies more than Trump himself ever did.
So where does this leave the GOP? If they openly reject Trump and 'Trumpism', they risk the permanent loss of a huge chunk of their voting base. But if they keep him as part of their coalition, then the anti-Trump coalition of liberals, leftist and moderates will stay together and remain energized against the spectre of Trump. And even if the GOP runs populists who reject Trump but embrace his 2016 platform, what if Trump decides to endorse candidates who are loyal to him, even if they advocate typical GOP policies?
I therefore expect that we'll see three distinct GOP factions emerge in the next few years:
-establishment Republicans (Romney, Graham, McConnell, Ben Shapiro etc)
-Trump loyalists (Pompeo, Mo Brooks, Hannity, Limbaugh etc)
-populists (I expect lots of new faces here, but possibly also people like Hawley, Cotton, and of course Tucker)
The things is, both the establishment and populist factions will be quite reluctant to be connected to Trump, while Trump's base only cares about Trump. Republicans won't be winning any national elections so long as this state of affairs persists. Which means, if Democrats were smart, they'd decide not to prosecute Trump and his family, and to leave him as a permanent Albatross around the neck of the GOP. But I doubt they'll be able to resist; after four years of hysteria they have to do something, their own base wouldn't allow anything less. So ironically, if Trump gets not only impeached, but has to face some kind of criminal prosecution after he leaves office, then the GOP's future prospects will look considerably brighter, since Trump won't be around to energize the left or to suck up all the populist energy.