Unfortunately, I think it will fail.
Constitutional Amendments SHOULD have to reach a higher threshold than just 50%. Frankly, I think more bad ideas get voted in through such referenda than through the acts of the worst legislatures.
On the state level I strongly disagree. State constitutions are simply too hard to charge, and too often state constitutions are Frankenstein monsters that are mixtures of different eras of a state's political history. Most states need to honestly just start fresh as a certain point. Making them harder to change is just ludicrous.