t is easy to see that the Court lost its legitimacy when only a bare majority became required for confirmation.
In the past, confirmation of justices was based on competence rather than partisan appeal. Furthermore, it was necessary to have a reasonable number of votes from senators of BOTH parties in order to confirm, which prevented confirmation of highly partisan and minimally qualified justices.
In looking over the confirmation number of Supreme Court justices, it is obvious that the Republicans are the ones who have politicized the court. Kavanaugh, Gorsuch, Alito, and Thomas (not to mention today's travesty, which I won't sully my fingers by naming) are all hard-right and confirmed with a bare majority. Contrast this to the confirmation of Elena Kagan (63-37), Sonia Sotomayor (68-31), John Roberts (78-22), Stephen Breyer (87-9) and most notably Ruth Bader Ginsburg (96-3). [On a side note, have you notice that, with the exception of John Roberts, all the others were nominated by Democrats? And the ones who barely squeaked through were nominated by the other guys?]
I propose that, should the Democrats win the Senate (presuming we don't end up in a civil war due to voting shenanigans) we restore the 60-vote (or even two-thirds) rule, and retroactively de-confirm those Supreme Couirt justices who who confirmed by the illegitimate partisan vote. If desired, those de-confirmed justices could be eligible to go through the confirmation process again, but need the necessary votes to be seated. The number of Supreme Court justices could remain at nine, though there would have to be a rush to fill the five vacant seats