This will be a fascinating event to watch play out.
The first and last USSC to be impeached was Samuel Chase, for being too partisan in his rulings (seriously). Of course, that was pre-Marbury vs. Madison. As a people we have to decide if we want judges to be their own ruling elite who make their own laws or listen to the people.
Although I'm skeptical this will go anywhere. November elections could rend this all mute.