There are two routes for constitutional change. One is a specific-language amendment passed by 2/3ds of both houses and 3/4ths of the states. It is limited to the exact language of the amendment.
The other is a constitutional convention. Once a constitutional convention is, well, convened, the entire constitution is subject to change. That is a BAD idea. Think of the potential for the left: delete the 2nd, delete parts of the 1st; add express right to abortion; ERA; gay marriage; etc.
BAD idea.
That's my take on it as well.