SCOTUS is the last and final word

John Marshall has made his decision; now let him enforce it!

Whether or not Jackson actually said it, the truism remains.

The power of SCOTUS rulings are dependent on who is in control of the other branches of the federal government, particularly the Executive branch which controls the military. Can't enforce anything without a POTUS willing to do so.

Also depends on who controls States governments. States can attempt to resist SCOTUS rulings. For instance, D controlled states labeling themselves "sanctuaries" where they not only refuse to enforce federal immigration law, but actively impede it. Or R controlled states who prior to the recent abortion ruling, continued to pass and enforce abortion bans despite the Court precedent of claiming that abortion was a constitutional right. Can you now see what the Left is freaking out over the possibility that Obergefell is overturned, which would embolden R states to support their marriage laws already on the books banning same-sex "marriage"?

Again, boils down to who has control of the real POWER... the military... or rather, the militia... the PEOPLE. All the world is in chess... moves, countermoves... risk assessment