Well, there would have to be an effort made at the international level. As the Canadian Bankers Association pointed out, if Canada prohibits Canadians from using offshore financial centres while the residents of every other country in the world continue to have that right, it will be shooting itself in the foot. That's obvious. There would have to be a centralized effort made for such a thing to actually happen.
On March 10th, 2011. See this statement in context.