In the battle over the US supreme court, Democrats can still have the last laugh

[Scruffy1]

16. The "court packing" plan was simple politics.

It was never a serious plan and all the garbage that has become accepted by the public is just plain bad history. FDR never even talked to the House Leader about it. It was just his way of sending a message of what could happen if the Supremes kept on with their BS. They had already become a bad joke with their Lochner era BS. It worked. By 1940 the Supreme egomaniacs had reversed themselves on most of the important issues of the day such as child labor laws and working hours
Roosevelt was a master politician and gradually the bunch of old white guys who lived in a bubble came to realize how out of step they were and started thinking about their legacy. I think it was a stroke of genius.