Who knows...maybe Nikon will come up with an APS-C sensor V1...or something like this... It would make perfect sense to me, as technology develops the auto focus process for continuous servo with mirror less cameras to work as well as the DSLR, that the DSLR will eventually be a thing of the past. And, Nikon and Canon both are working on this I am certain.
An interesting factor, seen in the early 1990's when Nissan came out with the 300ZX Twin Turbo, is that one does not want to make a leap forward so far the advances are to much to be marketable. This was the problem with the 300ZX...not as successful as they had hoped yet way ahead in some technical aspects.
So, a jump to a non DSLR which would perform like a D4 for instance, may be a failure and create a very real marketing crisis for any of the big manufacturers. For Sony and Fuji, less of a risk, and this may be why the NEX 7 and X-Pro1 are in existence.
And, when I get to post number 1500, I wonder if I can celebrate and put one and one half photos on PAD...?