According to Ian Young the Feds can end the QIIP[1]:
Although Quebec is in charge of choosing its immigrants, Federal authorities actually issue their certificates of permanent residency, and decide the speed at which to do so. According to Vancouver immigration lawyer Richard Kurland, there is no doubt that “the feds have the legal right, pure and simple, to cancel the program”. “This is not about a constitutional or legal barrier. There is neither,” he said.
1 - http://www.scmp.com/news/world/united-states-canada/article/...