I think your definition of "settled law" needs rethinking. From the moment RvW was announced there has been a majority of America saying it went too far. I'm not saying that the majority of America wants zero abortion, but they certainly don't want zero limits on abortion either. Despite a SCOTUS ruling that was far from "settled". It had dozens and dozens of challenges from many corners since its inception.Extrapolating that what Biden, Schumer, et al have said in the last 24 hours as lamenting for late term abortions is irresponsible. If I'm wrong, please point it out.
I think the fear is as follows: Many people, including more than one SCOTUS judge, have told Congress that they weren't there to upend settled law. Turns out that's not accurate. The question is now, what's next? I saw a National Review person say "Brown v. Board of Education is next". We're heading towards The Handmaiden's Tale, in a world where the majority of the population is actually progressive.