Destroy? I think the Constitution lives on a different plane and, like with the lesser gods of antiquity, is never destroyed.
Instead, it is just ignored and forgotten.
With each believer/practitioner who turns away, its purpose and intentions lose meaning and thus their power. And as they do, it fades away.
Sorta like when a business is purchased and the new owners begin a slow transition to make it theirs. The words, the people, the logo may stay the same for a while, but the definitions are changed. It's not as it was and eventually it may even become its antithesis, its original intent and true meaning and purpose only memories.
From that point of view and for many other reasons, chief among them being the mistaken identity and eligibility of the Commander and Chief, I don't know what we are, but I think we ceased being a constitutional republic quite a while ago.
We don't control our borders, our currency, our vote or elections, etc. The media belongs to the government, which uses it and its other agencies to punish and intimidate its domestic enemies with impunity. Laws are selectively enforced or not. Justice is for sale, liberties enslaved.
I don't know what we are now in this post 9/11 American lockdown, or who the new owners are, but I do know if we had actually followed this "US Constitution" you speak of, our little corner of world wouldn't look like this.