Look man, there is no provision that Congress cannot attempt to rewrite the Constitution either. That is such a specious argument that I am having difficulty understanding why you would bring it up.
Are you saying that the founding fathers made a mistake by putting Article V in there? It is what it sounds like to me.
No, they did not make a mistake putting Article V in there. But it may also be a mistake invoking Article V without a compelling national crisis forcing it.
It is all well and good to claim to limit the scope of an Article V convention to only specific subjects, but there is nothing in the constitution that provides for such limitations. At best it would come down to a Supreme Court ruling on the matter.
There is also nothing in the Constitution that would prevent Congress from setting up the specific rules and procedures of an Article V convention such as who would chair such a convention, how amendment proposals are presented to the convention body, whether the convention body must vote on each proposed amendment before it is formally adopted and presented to the states for ratification, etc.
There just might be a reason why Article V has never been invoked in the 234 years since the ratification of the Constitution. That reason is that there is enough uncertainty in the process to keep 2/3 of the states from petitioning for one.