You literally don't know that though. All signs point to them not doing that, because allowing abortions is actually popular. The only people telling you that Republicans will do that are Democrats. Also, even if they take a majority, they won't have a veto-proof majority, so there is no reason to go nuclear in the Senate when Biden is going to veto everything they do.
If they cared about popular will, almost every GOP controlled state in the USA wouldn't be as we speak trying to implement the most extreme abortion bans they can.
Popular will doesn't matter when you don't need to listen to popular will to keep power. If your insane, extreme base is all you have to pander to to keep power, the GOP is doing just that.
