It's not really a flaw as I was responding to the suggestion that Nikon's has done nothing to make us believe they are narrowing the gap between the top end of the DX range (at least the perceived top end) and the level just below it. We can only base an opinion on this based on current knowledge. Using that knowledge I argue we can in fact credibly state there is a narrowing.
Nikon has done two things to suggest this:
1. They are using their brand new technology in the so-called 'prosumer' model as opposed to using current, less sophisticated technology (The AF unit, meter and sensor for instance).
2. They are putting features in the so-called 'prosumer; model that normally only went in the 'pro' model: weather sealing, dual card slots, built in horizon level/intravolmeter, magnesium alloy construction.
Obviously we can't see into the future, but I strongly suspect that Stan is correct. Nikon doesn't have to do much to a D400 to sell it. Make it bigger (to give it a more 'pro appearance), give the 300/300s users their buttons/switches back, give the long time pros a CF card slot and allow 9 shot bracketing and they can tout it as the 'pro' model with all the same technology as the D7000.