What you say is true; unfortunately any government will tend toward preserving and enhancing what it sees as its rights at the expense of the rights of its citizens.
I hope the grand experiment does not collapse without being replaced by a better scheme. Unfortunately, I don’t know what that might be, and neither, apparently, does John Stossel.
It’s already being replaced by a plutocratic system where the country is run by the leaders of major corporations. I’m not sure if that is “a better scheme,” but it’s probably much closer to what the founders of this country envisioned than what we’ve seen in the last 100 years.