I agree Steve. I do presentations for a local wildlife group and have been asked to prepare one on the future of digital photography. The title will be "The futures bright, the future's mirrorless". I personally think that by the next round of new cameras in 4-5 years time there will not be dSLR and work is in progress to chase Sony's A77 etc. Work has already commenced in a controlled way by Nikon's 1, Olympus OM-D and others. I also believe that Canon are going the same way in re-considering it's APS-C semi pro sensor camera by issuing a serious firmware upgrade to the 7D rather than a new semi pro APS-C camera. I've seriously been looking at the Sony A77 for wildlife and Nikon (D800) for everything else including some closer static wildlife. The only drawback is the really long lenses would have to be 3rd Party Sigma etc.
If a D400 does arrive, which I believe is getting doubtful (Nikon surprise me please), then that will be the last APS-C semi pro dSLR.
This could of course be just the ramblings of an old man, however mirrorless is surely to be the way forward to achieve high fps with big MP sensors.