To me, I am thinking the founding fathers wrote the constitution and other supporting documents as a foundation to our way of governance.
As with any "foundation", all that is built upon it in later years, will have to be able to "support" the new addition(s).

How could any man expect his "ideas" to address ALL of the future needs, as a democracy is not static, but ever growing, as people from all over, culture, race, beliefs, etc, meld into one great society.....

On its face, it would be no different than any dictatorial government that has governed on the idea THEY believed they themselves, knew what was best for all.

Nah, I'll say as great and novel these dictates are, they are not written in stone. Amending and creation of new ones can lead to a more uniform understanding, with real distribution of power and opportunity to pursue ones "happiness"