. . . Abortion is a major institution OF the uniparty though. One thing that has been consistent is the Uniparty's support for legal abortion, with the only allowable defection/limit being on if Federal money was allowed to be spent on it or not. You can see that in how they constantly use the international institutions to push abortion on countries even when those country's don't want them.
Getting Roe overturned, despite the elites objections, is a MASSIVE blow to their authority and worldview. Instead of the Abortion Debate being settled by the Elites, it will be settled by the Populous. It would also show that there is at least one Institution in the US that ISN'T entirely captured by them, which is why there is so much of the core Democrats who are screeching about packing the court and overturning the filibuster so they can no longer be held back by those few politicians whom are not part of that mess.
I also feel the need to point out: Cultural Marxism started out with abortion. Abortion, and all the language around it, was the proving ground for the linguistic games the left plays. "Pro-Choice" "Women's Rights" pretending the "science" says something that it doesn't while accusing the other side of being "unscientific"... these were ALL things developed and testbedded in the Abortion debate.
The entire libertine morality system pushed by the "uniparty" as you call it, is founded on the idea of no-consequence sex. No-consequence sex is founded in abortion and the assurance of Roe that nowhere in the country can escape its reach.
Roe is one of the foundational cornerstones of the modern left and its project. Most folks know that subconciously which is why the sheer outrage. While it won't be that everything collapses with the fall of Roe, it is a massive change to the entire situation that nobody on the left really wants to see happen.