What's funny is I'm almost certain the republicans will just nuke the filibuster themselves as so as they have control and start passing all sorts of backwards, regressive policies. They won't think twice about it
If they have full control yes because at that point if they lose the presidency 4 years later they just won't certify the results (aka we'll be a full on fascist dictatorship and they'll do as they please).
I've seen in this thread Republicans have no reason to get rid of the filibuster because they mainly just want to maintain the status quo/obstruct the Dems.
Well, if they aren't going to give control back to Dems that will change. They'll be all aboard their fascist, backwards, terroristic agenda.
More than that it won't even come to having to not certify a Dem winning the presidency, if we don't protect the elections in the states with voting legislation they'll just rig the game in enough states that they can't possibly lose. We'll basically just be a tweaked version of any other autocracy that has "elections." They will largely achieve this by calling into question actually free and fair elections and replacing them with rigged elections in their favor in perpetuity, and half the country won't realize the hypocrisy, or worse, actively support such a system.
This is the republican gameplan. It's been in progress for decades and vastly accelerated over the last 4 years, and they are passing legislation in the states they need to as we speak to ensure they don't lose again. The leader of their party just 5 months ago nearly succeeded in a huge shortcut into enacting this plan. It's pretty obvious what their plan is.