but what happens if they "pack the court"?
If the House tries to pass such a measure, they may be in for a surprise. Packing the court didn't pass under FDR, and I don't think it'll pass now. Dems already lost a bunch of House seats, and if they keep supporting the Pelosi insanity, they'll lose the House next midterm (may already be a foregone conclusion -- that's the norm).
I can see many Dems breaking ranks with that effort, since the number of justices is based on a 150 year precedent, and it may only be in their favor for 4 years, when a Republican House and President can either add more, or revert back to 9.
Making the court a political tool for either party is a bad move.
By the way, only Congress can change the number on the Supreme Court. That requires the House AND THE SENATE to pass the measure. I doubt a GOP-controlled Senate is going to approve.
I do worry that a couple of judges may retire/die under Biden's administration. If they are banking on that, too, then it's unlikely they even need to try and increase the number.