Let me ask this question. When you buy grey market, you typically get the Nikon "Worldwide Warranty" certificate in the box. I know, because I have gotten it with all my grey market gear. This is worth something, right? You are permitted to import a product that you bought yourself while out of country. Someone has to honor that warranty. How does a Nikon service center distinguish between a grey camera/lens that you bought at B&H, and a camera/lens that you bought while on vacation in Japan or London, or Toronto? Are we really saying that it will be impossible to get that camera/lens repaired? Even if you pay? Are these repair places doing so well that they can afford to turn down paying customers (who will pay right now, not have to wait until Nikon reimburses them for the repair)?
I find that highly dubious. There have to be a lot of good repair places in Canada - not a long shipping time and they speak English - who will repair your gear.
Maybe I'm wrong (and with my luck, my grey gear will break tomorrow), but I think there are rules, and then there are practical applications of the rules. I'm convinced that someone will repair your gear.