Agreed. However, they did so in a time when the show was not being run by the uni-party. Today, the GOP would bend over backwards to give the left whatever they want in an Article V convention. One would be delusional to think otherwise, especially after the actions of the GOP in this election.
First, an Article V convention or Convention of States is not allowed to consider anything outside the call of the convention.
Second, 3/4 of the states (38) have to ratify anything that it produces.