The Dem leadership has been splitting the baby for years by allowing the ever-increasing radical wing of the party to bloviate about this without ever letting meaning legislation to the floor to enact the changes this group wants, so credit where credit is due, I guess.
Two justices are blatantly corrupt and should be removed from the court. Two more are there through GOP malfeasance, but there's nothing we can do about them at this point.
No other democracy has lifetime appointments for high court justices.
As far as packing the court, I am personally interested in any kind of reform that depoliticizes it somewhat, whether it be that the SCOTUS acts like the Appeals courts and is a rotation, or the appointed Justices choose a second tier of judges unanimously.
But process only does so much to prevent partisan political interference. At the end of the day, our amendment system and our Congress are broken. It will take something like a mild revolution or major systemic breakdowns to fix it.
As a side-note: I think limiting the term of justices would overall strengthen the supreme court's integrity and I think the right would agree. Or, at least, the right would regularly agree but they won't now - because they stuffed the court with cronies. Once the situation is in your advantage, surprise! The narrative changes.