If I read John Eidsmoe (Christian Legal Advisor”correctly FDR appointed liberal judges to the Court replacing the Conservatives that retired. I suspect they knew of this but believed like all “progressives” that they knew better than the framers of what they considered an imperfect and outdated Constitution.
Congress long gave up much of its Article 1 Section 1 powers to the courts and administrative agencies. The reason I am not very hopeful for a return to constitutional government is a practical one. What do we say, "We really, really mean the Constitution means what it says this time around?"