“on the Application of the Legislatures of two thirds of the several States” the Congress “shall” call for the Convention is the wording. If that were to be somehow denied or tabled, I believe that those here now calling for an armed revolt would see it happen.
After Congress sets the place and time for the Convention, it is no longer involved.
The wording is perfectly clear. What are the chances of Congress ignoring something so unambiguous? They could no more ignore those words than they could ignore "shall not be infringed" in the Second Amendment.