I think they do after seeing their bonuses. Their strengths lie in grabbing lots of territory, peacekeeping and trading. If that isn't a Canadian civ bonus list, I don't know what is. Plus the territory thing. Granted, Canada's capital isn't directly in the line of the Cree, but a lot of Canada would overlap them. And in terms of civ bonuses, the overlap is just too intense. Byzantines and Ottomans have entirely different defining traits.
Canada could still be in XPAC 2 though (or in more DLCs, which I'm thinking won't happen). Once the UN is in place, I could see Canada having a different set of traits that could differentiate them.
Ok, however for a long time, lots of fans have been begging for a Canadian civ. They did this to Australia (I can't think of another reason why they would add Australia as a civ, other than to make money off the fans who wanted it, lol), so they could certainly be considering it. Aside from this, I think they can manage plenty of Canadian cities as separate cities for the Cree, and I'm sure their UX will be quite different anyway. This all being said, I'm not particularly interested in a Canadian civ myself (though not opposed either, but they aren't on my list of desired civs), I'm just trying to predict here. Perhaps we will see Canada at some point still, but if not then I get a strong feeling that we will see them in Civ 7.