Earlier quoted context omitted.
>We could revoke the 13th and 14th Amendments and have slavery again--there is no legal impediment to that. Actually, I think this is the genius of the amendment system. You are correct that it could happen. But unlike laws that can be passed or revoked by Congress by political whim, the barrier to creating or overturning Constitutional amendments is much higher and more difficult to pass.
There's a famous story about the logician Kurt Gödel related to this.[1] In preparation for the US citizenship test, despite assurances from his friends Albert Einstein and Oskar Morgenstern that the test was a mere formality, he studied assiduously all sorts of details about local and national government, including the US Constitution. He quite excitedly told Einstein and Morgenstern that he had found a weakness in…
The UK manages to be a Parliamentary democracy without having a single coherent constitution at all, let alone one free of logical defects- so having a perfectly consistent and "loophole-free" constitution doesn't seem particularly important in practice.
The easiest way to wholly undermine the US Constitution is to just expand the Supreme Court bench and then pack it with your cronies, who will then let you do whatever you want and call it constitutional. No amendment needed!