Seems unlikely. If there was proof to be had the election was stolen, the Republicans would have found it by now. More likely Trump's been such a loose canon that's accomplished so little, that whipping a mob up into a frenzy aimed at them was the last straw and they just really don't want to have to deal with him again. Nor are they keen on seeing what he might do with the privileges he'd be entitled to as a former president who served out his term. A lot of Republicans would be similarly happy to see him gone, but aren't keen on the potential precedents that would be set in punishing Trump at this point. That's probably what McConnell is weighing at this point. Punish Trump, mostly get rid of him, but risk unpleasant long term precedents? Don't punish him, risk him dividing the Republican vote next election, but avoid worrisome precedents?
That would probably be the best thing for him and in general, with the second best thing being Trump using the 25th amendment to hand power to Pence for the remainder of his term and spend the rest of it golfing. However I don't think Trump's capable of thinking in those terms. It'd require too much admitting he'd fucked up and done something wrong. Also he may not be confident that Pence would pardon him. Pence is still probably pretty pissed at Trump; just not enough to start bending the intent of the 25th amendment. So Trump remains in place and Pence spends his time praying nothing else happens before Trumps term is up and it's no longer Pence's personal problem to deal with shit.