Actually, my brief includes the argument for the referendum. No matter if it wins or loses, first of all, it's a de facto precedent that changes like that require a referendum.
There is another situation. Let's say the government changes, and I don't care what party forms the government in 2019. Let's say they mention during the campaign that they are opposed. The logic that is being used right now would give them the opportunity to say, “Okay. You guys knew that we were opposed to that. You voted for us, so don't complain now.” They could just arbitrarily redefine the voting system as they pleased using this case as a precedent, so a referendum better be there.