@HDNitehawk You are correct that at a certain point increasing the MP just increases the resolution of blur. With the kit lens that came with my T2i the 18 MP APS-C sensor I have is already at that limit. The blur does not have to be optical - it can be motion as well.

I think it's important to keep in mind that the 36 MP camera is basically the same pixel density as the 7D (T2i, T3i, etc.) but those cameras are used much more often in sports or fast-moving objects. I think the reason Nikon is making a point of this is that FF users aren't used to seeing motion blur at the pixel level - but really it's only about 50% worse than a 22 MP image.