The problem is that we don’t know exactly how they’d vote if they knew their vote was going to be a deciding factor. Seen quite a bit of “decency” from certain Republicans on various issues, but it seems like that only happens when they know there won’t be enough votes to enact something (like Trump’s impeachment). Whenever the vote is expected to be close, all the “good” Republicans tend to vote in
goose lockstep with The Party, even it seemingly contradicts any sensible statements made previously on the same matter.
So yeah, if the GOP had control of the chamber in January, I’m not 100% sure if enough would have sided with the democratic process. Republicans seem to have some morals and sensibility…except when they see a chance to expand or lock-in power by ignoring rules and precedent, particularly because they know they can probably get away with it. That’s why I also tend to believe they won’t hesitate to nuke the filibuster if they get power back and doing so would grant them the power to pass all sorts of awful and hard to remove legislation, effectively entrenching (even further) minority-rule in the US, something along the lines of “only Republicans get to appoint judges, make rules, and decide elections”.