I think it is more relevant t to look at what Nikon's lineup has that competes with the product and the pricing. For example the current 80-400 is 2600, but the competition for it in the lineup that would produce better results is all significantly more expensive. With the 70-200, there are cheaper options, but they are all clearly inferior.
With bodies you have the d7100 at $1200 and the d600 at $2000, and for that matter the d800 at $3000. I just don't see Nikon marketing another DX body whose price falls between a d600 and a d800. In fact I find the possibility of a DX body costing more than the low end FX body to be virtually non-existent. It simply wouldn't make sense from a marketing point of view.
If we see a D400 I say it's a lock that it comes in under the d600. . The d7100 is superior in technology to the D7000 and is around the same introductory pricing as when the d7k was released. Ditto the d800 in relation to the d700. The d600 is technologically superior to the d700 and yet came in with an introductory price $1000 less than the d700 due to its target audience. Nikon is very careful not to prey on its own market.