The GOP base is so deeply devoted to Trump, that he been convicted and barred from running again like he should have been, most Republicans would have either refused to vote, or there would have immediately been a violent civilian powered coup backed by Trump, and he'd have been sworn in again anyways, with most members of Congress in both houses being killed in the process.
I agree to a point. I am also thinking that even if he was impeached, Donald Trump would have found a way to get back in as President in 2024 by running unpledged elector slates in the 7 states he contested in 2020.