The may sound callous, but I could care less if dems/repbulicans switch parties. To be blunt, if they aren't conservative/libertarian in focus, then by definition they maintain some socialist traits that, cumulatively, makes it irrelevant if they are D or R.
Indeed, I'm still looking at the R's being in the mid-fifties after the election, with enough conservative votes to preserve a 51-vote majority (50 votes is not enough to Biden-proof legislation).
If the GOP doesn't get in the mid-fifties, then look for Biden to become more of a player around Senate voting time.