Actually, I see a net gain for Canada as the first to flee the USA will be the most productive. We’ll just have to be sure to slam the door on the parasite class.
BTW our immigration system gives preference to Americans who hold professional credentials or have capital to start a business. And our corporate taxes are lower.
Canada is very dependent upon the United States for any number of things, both economic and geopolitical. I wouldn’t crow too loudly or too long about the rise of Canada at US expense. If we go down we’re dragging you right behind us.