Unless they manage to steal another election, they will not soon have the control of government to do anything to pack the court. Schumer and others are barking about "resurrecting" the drive to pack the court, as if they had simply decided to bow to the will of the people a few months ago. Had it not been for Manchin and Sinema, they'd have already packed that court, added two new states to the nation, and likely attempted some kind of draconian restrictions on 2A. It was VERY NEARLY a tragedy and a Democrat was the one who stood in the breach and refused.
Sinema may pay the price but I doubt Manchin will be removed so as long as he doesn't flip on his support for keeping the filibuster, the court should be stable, for now. I fully expect their butthurt reaction to include a redux of the summer of '20. Every time they don't get their way, they escalate the level of destruction and violence in an attempt to intimidate their opponents. It's simply a matter of time before the shooting begins and once THAT happens, the inner cities are going to become true war zones. It won't surprise me to see the Guard deployed to try to bring order in NY or LA, or Chicago.