Congress should amend the Judiciary Act of 1869 to allow for 15 justices.
I don't know about that. It smacks of FDR's attempt to "pack" the court back in the day. I would prefer a constitutional amendment to limit the terms a SC judge can serve. How about 15 years instead of 15 justices? Or maybe 12 years and limit the congress to 12 year terms also.
“Congress should amend the Judiciary Act of 1869 to allow for 15 justices.”
Better that they go back to the seven justices that used to be on the court. They can retire the junior most Justice (last hired first fired).