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The state and local governments are already responsible for Interposition to ensure that the Feds don't overstep their authority. Unfortunately, they have ducked this responsibility.
For them to do this, they need no further amendments. This was the action the founders intended to keep their sovereignty. If the states band together, and fulfill their responsibility, then violence may yet be avoided.
A convention for further amendments at this point, does nothing but put off the day for the states to do their duty, and gives the Feds even more time to abuse and consolidate their power.
When the states call for an Article V convention, it is the very act of banding together to fulfill their responsibility. Why do you suppose the framers included this in the Constitution?