Absolutely, it's a slippery slope. If the wording is that it's a recognized national holiday, but not necessarily a day off, the provinces are potentially going to make it a provincial holiday and it will just be another day off with pay that the folks can do the things that they want to do and they won't remember. If they're in school they're more likely to, in my opinion.
On April 22nd, 2015. See this statement in context.