Thomas Jefferson emphasized that if the oncoming generations (meaning us) perpetuated the Constitutional pattern (actually fought for our Constitutional rights), the federal government would be small and cohesive (lol) and would serve as an inexpensive operation (crying softly) because of the limited problems which would be assigned to it.
The true theory of our Constitution is surely the wisest and best, that the states are independent as to everything within themselves, and united as to everything respecting foreign nations. Let the general government (meaning federal) be reduced to foreign concerns only, and let our affairs be disentangled from those of all (this means ALL) other nations, except as to commerce, which the merchants will manage the better, the more they are left free to manage for themselves, and our general government (federal) may be reduced to a very simple organization, and a very inexpensive one; a few plain duties to be performed by a few servants.
Please read "The 5000 Year Leap", Principles of Freedom 101, by W. Cleon Skousen.
This book emphasizes that the Constitution is not out of date. It is no more out of date than the desire for peace, freedom, and prosperity is out of date.
It explains the principles our Founding Fathers used when they came up with our Constitution.
It is an outstanding book every American citizen should read and re-read and teach their children and grand children!