Maybe next spring, as this new FX is priced above the old D300 price point. And there is a huge gap between the D7100 and this new camera only filled by the D610 at the moment. So I can easily see them doing a DX version of that FX camera early next year to fill this gap.
The thing about talking about gaps in the price structure of Nikon cameras (or any manufacturer of cameras) is that the prices are coming down all the time. And the more often they bring out a new camera, the quicker the previous model depreciates. And the quicker they have to discount to make sure they don't have stock left for the next model.
Ironically the D300S kept its value pretty well because it was not replaced, either with a 'D400' or a D7*** that was good enough to better it in every way for a lot of people. It's combination of build and feature set was valued.
The more often they update a previous model, often with a minor update, the quicker it significantly devalues the previous model. People are now knowledgeable enough to either wait for the lowering of the release price, or they will pick up a 2nd hand previous model from an early adopter of the new version. That is of course if they stick with Nikon. ;-) Brand loyalty is not what it was, but I don't think Nikon realise that.