If you cannot elect the Goverment you want, why in the world would you think you can elect the Constituional Convention you want? It stupidity in voting that is the problem, not the Constitution.
But are you suggesting that we try to "fix" 300 million Americans as a more achievable goal?
Or are you suggesting that we accept the status quo of $1.5T annual deficits and rampant government corruption, because, hey, people are flawed and you can't really fix that?
In short: what's your plan?