Do Over: A new constitution and bill of rights? - discussion, questions, and brainstorming

(this image comes from commons.wikimedia.org and is public domain)

The Union created by the constitution of the United States of America was a grand experiment in personal liberty. However, I would argue that this experiment is currently failing in its design to meet the intent of the founders. I would like to begin a discussion about what (if anything) could have been done better "in order to form a more perfect Union"

I invite participation in discussing the merits and follies. I also would like to gather questions to use as a jumping point for further discussions. Perhaps we could re-engage in the debates of the federalist papers, and beyond, and see if it is possible to make a more perfect system of preserving liberty while providing basic safety or recourse for violations against liberty.

Here are some of my initial questions: (please feel free to pose additional ones in the comments below)

1. Is there a need for a centralized federal government?
   The founding fathers believed there was, though they wanted to limit its capacity to only providing for the common defense and for resolving differences that stretched across the boundaries of sovereign states. Initially, the jurisdiction of the federal government was only; to regulate interstate commerce, provide for the common defense, and to coin money.

2. Through the rise of blockchain technologies, a decentralized trust model for coining money seems to have possibly obsoleted the need for a government to coin a nation's currency. Could a similar model do the same for the other two major responsibilities of the federal government?

3. What rights should be enumerated in a bill of rights? Did our founders get it right when they amended the original document to include these? Is their order in the bill of rights correct? Should any of them be re-written so as to remove the ambiguity of their intent?

4. What should the goals of a constitution be (aside from defining what constitutes a form of government)?

5. What better forms of government have not yet been attempted?
   A democracy is mob rule, and the mob can be fooled from time to time, but a representative republic concentrates the decision-making power in representatives (who have been shown to be corruptible). If some people cannot be trusted, then how can we ensure that decisions are not left to the untrustworthy, and how do we prevent or safeguard against coercion of those with the decision-making authority?

6. The Greeks (and specifically Aristotle) studied many potential forms of governments, are there any that have not yet been studied? Are there merits or faults originally not discovered by the greeks?