“The Dems could be in the minority very soon, and might want to take advantage of the filibuster themselves.”
Nope.. they will change the rules back, and the POS republicans will roll over and let them. Mark my words.
If they are no longer in the majority, they cannot “change the rules back” (sic). They will be stuck with what they have wrought. This is really a mute point, because it is unlikely-to-high-unlikely that the Senate rules will be changed.