I also think that few people realize that a Supreme Court Justice is literally at the top of the heap. It's a lifetime appointment and no one can ever influence them against their will.
That, of course, is the whole purpose of judicial appointments. But it applies in full force with the Supreme Court.
This is not the Roosevelt era. In today's clime of instant news, no sitting President will ever again be able to threaten the Court with packing. The people would not stand for it and the Congress would look at their own powerbase and kill it outright.
Having written the above, I'm with Max. There is some little cause for hope.