The supreme court justices don't worry about court packing because they don't want to be relevant. If they did, they would have already upheld the 2nd amendment and stopped Congress from abusing the interstate commerce clause by now.

The court is happy being irrelevant for constitutional matters. All the supreme court has cared about since at least Woodrow Wilson is social justice and helping Democrats bring communism to the US.

This isn't 4D underwater chess, the court is not on the side of the founders. The court is and has always been globalist. They've recognized "precedence" set by European courts since their inception. Lawyers from ivy league schools don't give a flick about the constitution. They are taught European law.