I’d argue this should have been the immediate response to Mitch McConnell blocking nominees half a term away from an election, but if the court can’t uphold the rule of law, it should be fixed (and expansion seems like the obvious solution) or replaced.
The procedural question on this one is whether he could shrink the court to boot say… Thomas, then expand it again to replace him with someone less obviously corrupt. Republicans fail to confirm a replacement? We’ll shrink the court a little more. Obviously, this won’t happen, but I’m interested to know if it’s possible.