I think one of the issues is that the Signers of the Declaration of Independence were elected by their states. To do this correctly, there would need to be some sort of cohesive group.
The Constitution DOES allow for future Constitutional Conventions to be called by two-thirds of the states whether the federal government likes it or not.
What about when even representation has been usurped by a power elite with an undreamed of form of media, by rules tha ensure election in districts by the same or similar persons, by rules that make it impossible for others to be on ballots, etc?
Is that not usurpation that makes a system that is impossible to respond to the citizens?