The "nuclear option" is not about doing away with the filubuster entirely. It merely puts judicial nominations off limits to filibusters. So this would not be turning the Senate into the House
As to the what if we fall out of power scenario. You know what will happen. We'll confirm their judges 98-0 like we did for Ruth Bader Gisnburg. For a pascifist to give up his weaponry is no sacrifice at all.
The rats cheat and lie and steal. That is sad, but I admire the Republicans for not following in the rat's footprints. Over the last 4 years we have confirmed some excellent judges. Your characterization of the Republican Party as "pacifist" is an opinion and an ignorant one IMO.
If we set the precedent that we will change previous Senate rules without regard to rules that are now in place then anything goes. I don't see how one assumes that a brand new rule allowing filibuster for legislation but not for judicial nominations, will not evolve into a no filibuster rule on all legislation once if and when the 'rats gain control again.