Respectfully disagree. I believe that the first pronouncement from any Constitutional Convention will be: “From each according to his ability, to each according to his need.”
That said, in my view, a convention would also be the avenue to secession. Set the ratification requirements accordingly, and if you don't like what you get, don't ratify. Then you're out of the union.
By the way, isn't that what we have now? Seems like it to me.