You're talking in particular about the threshold as 50% and then 60%?
You can argue it both ways. Some matters—and I'll stick my neck out here—such as with Quebec's separation, once you get a vote of 50% plus one, the world has changed the very next day because you now have an item of instability that must be dealt with.
On the other hand, when you have an existing constitution that is working adequately, you may want to have a higher hurdle rate. I personally was very disappointed that the B.C. reform didn't go through because of the higher hurdle rate, but nevertheless I've never criticized that. I appreciate there are arguments that constitutional documents should have greater stability in order that the polity itself can rely on them.
I repeat that the matter of Quebec's separation, 50% plus one, is a different issue. I'm not talking about the existing Canadian Constitution, so—