I tend to agree, despite my reference earlier. People seem to forget these were practical men, who knew how to compromise and work together despite their differences. If you look at the Federalist papers, they also knew big business and the privileged were the biggest dangers the nation was going to face. And they were right.
People invoke the founding fathers to justify any kind of reactionary, backwards-thinking traditionalist rejection of anything new and threatening, which conveniently forgets that those men became famous because they created something that was new and threatening at the time, visionary for its era, and, better yet, intended to make it flexible and able to be altered as society progressed.
Their flaw was in thinking that everybody was going to actually change and grow they way they tried to.