I think Ontario has the same problem/tailwind London has, which is that there are more than enough home-sick and uncreative Americans to saturate the first few stores, especially when they first open. That said, if it was going to succeed anywhere, I'd expect Canada to work out, since there's such general cultural overlap with the USA.
But beyond that, I don't see how they achieve anything like the 2014 dreams of international store-count without seriously compromising their position on menu simplicity and ingredient sourcing. All the prior successes of brand internationalization have involved shameless and grotesque local market optimization. Will Chipotle begin cutting their guacamole with sesame oil and vinegaring their rice to make it in Japan? Are they going to build the organic, fair-trade pinto bean supply chain in Malaysia from scratch?