First, Levin is proposing a solution for how to deal with the Federal leviathan from the grass roots up. While he says we should still fight at the Federal office holder level, he says it's much easier to influence policy at the local level. Indeed, we see this all the time in our states.
Second, now that Levin has shown that STATE level politicians can have a dramatic effect on national politics, I think you will see the state legislatures getting active. In fact, the smart local politician will run on making these amendments his priority.