I agree to a point, but that is the same reasoning that the left uses for health care, amnesty, welfare, etc.
The founders were bright enough to write a solid foundation for our government and give it the flexibility it needed both through defining the powers and scope of the various branches as well the ability to be amended because they knew the world of 1789 would not be the world of 1889 nor 2009.
They also installed checks and balances and made the amendment process challenging enough that changes would hopefully not be simply at the whim of lawmakers nor open to timely fads.
They left in our foundation the ability for leaders to meet the challenges of their times. The fact this has been abused is no cause to throw the baby out with the bath water,especially when it comes to the realities of 21st century defense.