I think people overestimate how important the Cree event was. It was one headman, who didn't speak for the entire Cree nation, and who had a political agenda to push. Many people probably never heard about it. The Poundmaker Singers seemed very enthusiastic about the portrayal of their people. It seems probable the Haida asked not to be included or else the devs ran into some problem incorporating them, but obviously they were able to make things work with the Cree. Likewise, the Tewa asked not to be included, but clearly they were able to make it work with the Shoshone instead. A few years ago the Mohawk Tribal Council worked with Ubisoft on Assassin's Creed III. Tribes like the Iroquois, Sioux, and Cherokee are accustomed to media attention, which may make their inclusion likelier. TL;DR: The Cree thing wasn't that important, and I'm confident we'll see another Native American civ.