The federal government is supreme? I do not believe that at all. I believe the people are the ultimate deciders.
As far as what prevents the convention from simply deciding that ratification of the House is all that is needed? Again the answer is the people. The people are supreme and simply would not allow it. They would lose consent of the governed and the whole thing falls apart.
Ah yes, but now we are back to talking about voting them out of office, aren’t we?
If we can hold our representatives accountable, then why a need for a convention?