"For all practical purposes" is not a constitutional term. The only way to repeal any constitutional statute is to amend the Constitution with an express repeal of that statute.
“The 10th Amendment has, for all practical purposes been excised from the constitution.” — Jacquerie
Sad but true. While Amendment 10 is also correct, pragmatic anti-constitutionalism side is EXACTLY what drives DC these days. And Kagan, our new Supreme Sandwich court member, had ended Constitutional studies in Harvard when she was a dean.
Ever since Teddy Roosevelt bypassed the Constitution to found national parks, we have had a MALIGNANT TUMOR that has eaten away respect for the Constitution. Sure, national parks could have been formed through an amendment, but Teddy was too impatient for that. Then Clinton got away with his corrupt Escalante land grab with that same kind of power [to the profit of a foreign power by the way].