Sometimes I think liberals can hear and read all the rhetoric about how awful Republicans are and understand it. But they fail to understand the perspective of why Republicans are doing the things they do. Republicans perspective is that they are under existential threat by demonic radicals and any and every measure including violence is on the table. They are no longer thinking in a political terms. They are thinking in Civil War terms. They are reaching a point they would love to be able to gun their "enemies" in the street. The time for debate and following the traditional rules of politics is over.
Everything and anything for their side to win will be done and there is nothing democrats can do, politically, will stop it. Like you said, once they take office there will be no debate or consideration of whether they should remove the filibuster if it becomes an obstacle. They will do it quickly and move on enacting their agenda.