The thing about a referendum is that it is either a yes or no, and the majority is unquestionable. The voters' paradox doesn't come into play. It would be very interesting, I think, if a referendum were coupled to the 2019 election. I think if the government went ahead—and it's presuming it's the same government and they win the election—then they would not run into much opposition from the Supreme Court. However, it's not just the federal constitutional architecture that's involved with respect to the central government: it also involves the provinces. I bet you dollars to doughnuts that some premier in 2019 will consider this a fundamental change in the nature of federalism, involving the provinces as well as the central government, so that you still won't necessarily avoid a court challenge.
On August 23rd, 2016. See this statement in context.