I cannot imagine a single issue from the left or the right that would get the necessary number of states to ratify.
In their wisdom the Founding Fathers gave us a way to change the Constitution. Also, in their wisdom though, they made it difficult to change on purpose. If it was easy, the left would change it willy-nilly and be full of self-contradictions, none of them good.
So we propose and then we run on it until we get the votes.