Reading Nikon ads and publications like Nikon Pro about the D7000, including it as a semi-pro camera and saying that "is not the D90 succesor", my thought is that the D7000 is the D300s successor. So maybe the D7000 is the actual -and only- DX flagship. Don´t you agree?
When reading posts like these I almost always get odd flashbacks from a classic Monty Python movie scene, one with a dropped sandal ...
Anyway, I actually do think you look at this issue from the wrong angle. Stop worrying so much about language subtleties in marketing material and look at the bigger picture ... And most probably a bigger picture consiting of more pixels ...
The D7000 has in many ways been cannibalizing on D300s sales, which is not ideal, but probably not something Nikon excecutives loose to much sleep over. What they probably do however miss considerable amount of sleep over is lost Nikon sales in their favourite market segment - to Canon Eos 7D. This segment has for a long time been a monemaking segment for Nikon, think D100, D200 and D300 and all the nice high margin lenses owners of these cameras tend to buy.
In short, after dominating this profitable serious enthusiast market segment for several years, Nikon need to up the ante to make the 7D look a bit lame for its price. Just like Nikon did with Eos 30D, 40D and 50D who did indeed look a bit under-featured and over-priced compared to D200 and D300.
There are plently of very interesting rumours flying around about new upcoming Sony sensors. So very probably a potential D400 would have a sensor up and beyond the one in D7000. But even if it does stick with that (excellent!) sensor, a D400 would need to be a significant upgrade to compete with Eos 7D. And I think the amount of upgrade we saw between D90 and D7000 might be a hint of how much upgrade Nikon would want to do between D300s and a D400.
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I don't suffer from insanity, I enjoy every moment of it!
By the way, film is not dead.
It just smell funny