Hamilton played as significant role in the calling for the convention, the writing of the document and its ratification and explanation as any man. Madison was not the "principal" author any more than Morris was. This "father" of the constitution title is dubious at best though his role during the 1780s working closely with Hamilton in driving the nation toward the CC was critical. That work was superlative in sharp contrast to his thought after falling under the sway of Jefferson which attacked what he had help create.
We have not been discussing what the Founders would have thought about our current government and what I have claimed about what they believed about their own times is entirely true.
While they certainly would have been shocked by the growth of government they did not have the ability to foresee the rise of totalitarian dictatorships bent on world domination or a world religion filled with suicidal lunatics bent on the destruction of western civilization. So I will not claim knowledge of what they would have thought about the current government. I will say they would not have advocated National Suicide because of ideological blinders. Jefferson (though not a "Founder" under a strict definition) might have but not the greatest and deepest of those thinkers.