Well not all First Nations get along, we in the Confedaracy do, for the most part. But that does not include the multitude of other First Nations and from time to time, they clash politically and ideologically.
The world will never accept the concept of Turtle Island, because it flies in the face of religous notions. They may see it and understand it from a Native context, but it will never be embraced as a definitive theory enmass. Hell, I don't subscribe to the whole of the idea. It's antiquated, romantic, spiritually important, yes, but not really what the world needs at the moment.