We are all, by now, familiar with your favorite little quip. I would care about Mr. Spooner's opinion if he had something superior in mind. Does he?
http://lysanderspooner.org/node/4Read some Spooner and you're realize he's one of the prototype minarchist voluntaryists.
The notion of an inherited contract (i.e. birthright compulsory citizenship, that a nation could "claim" a person born free into this world) was abhorrent to him. As such, the Constitution might or might not have been valid for the handful of men who drafted and agreed upon the thing in the 18th century, but not valid for the millions that did not draft or agree upon it in that time and certainly not for those not yet born to be compelled by it.
He was not about to go and dictate that you, fistful, should adhere to his particular form of government he idealized. He also would suggest that you not dictate to him that he must adhere to your particular form of government which you idealize.
However his demonstration of the combined impotence and ineffectiveness of the COTUS to restrain its own government is none the less potent, despite lacking a proposal for an alternate statist governmental structure as you request. You manifested the very same notion in very similar words.
I would add from my own perspective... using the COTUS as a shield to defend your God given and naturally derived rights is a logical fallacy. It is not one that our founders made when asserting those rights (obviously... since COTUS didn't exist back then). Enshrining COTUS as some sort of mystical symbol just grants your enemies clergy-like power over you when they abscond with that symbol and its mantle of authority.