I think what would happen is that the Solicitor General of, say, Saskatchewan would appear before the Supreme Court of Canada and say that it is a fundamental alteration of the nature of the federation. Whether that's going to be a success or not is a separate issue, but I've heard provincial politicians say this. I'm not going to defend their reasoning, but I think that is one of the implications.
On August 23rd, 2016. See this statement in context.