It's going to be interesting, since even if the motion is defeated, it doesn't change the fact that the discrimination is "unjustified" and inconsistent with the Bill of Rights Act. Ignoring the Bill of Rights is a slippery slope for any government to go down, because then it becomes a decision for the government of the day which rights you have, and which you do not.
To add, all the government needs to do is repeal the section of the Electoral Act that says a referendum or supermajority is needed, and them -boom- no referendum or supermajority is needed. And doing that requires a simple majority!
Frankly, if you believe in the rule of law, and the absolute protection of human rights, you have no choice but to support that action.
But how is it different from the drinking age as just one example, isn't that just as discriminatory? Wouldn't lowering the voting age open Pandora's box?