The constitution, as it is currently written, gives the citizenry enough power that we could be the dominant force in our own nation, and could regulate these tyrannical megacorps. If the citizenry had the wisdom and courage to enforce it. As long as Americans will sit by, watching their porn, playing their video games, and feeding their junk food addictions, all while their current constitution is being torn to shreds, no new constitution could be useful. We could have a perfectly written constitution, specifically addressing all our modern problems, and guaranteeing all our desired freedoms. But the American population would largely rely on politicians to make sure the will of the constitution is done, and on media corporations to inform them if that process breaks down. Barring any notification from Fox News or CNN that we're losing our country to the small handful of rich powerbrokers that fund both politician and journalist alike, most Americans will be fine with popping their anti-depressants and distracting themselves into oblivion. When Americans are willing to hear out the small number of voices telling them uncomfortable truths about the dire nature of their nation and society... when Americans are willing to fight for what little they already have, then maybe it will be useful to speak of what we can add to it. Until they are willing to fight, we are just discussing prettier shackles.