McConnell has never liked Treatler and just used him for his own ends. Also, I think more Senators are less likely to be forgiving because they aren't quite at the whim of voters.
But they are at the whim of registered Republicans, I think -- the reason they were all so scared of Trump was that they feared he'd use Twitter to get them primaried by his MAGA supporters in their home states if they stepped out of line.
Now that's not so much a threat, so long as he's off Twitter, but I guess if he gets on OANN or Newsmax demanding that RINOs who vote for his impeachment be primaried, lynched and run out of town (not necessarily in that order), it might still cause problems for some of them.
Dunno. So much can happen in the next couple of months, I guess.