I agree with all you say except perhaps not even 24Mp as I suspect that a high noise ratio will be a problem with large crops. I'd settle for 16Mp with improved noise reduction and therefore the ability to use higher ISO's than I currently can on the D7000.
As I have said many times, the only time I need more than 12Mp is when I want to print images above 16x12ins and I know there are folks here who have successfully printed larger than that on 12Mp sensors. I just want lower noise for reasonable crops principally for web work. There is a tendancy with any camera/lens combination to try and overeach on a distant subject and I suspect no matter how much the technology advances, this will remain the case. No one has been more guilty of expecting too much in the past than myself
For us who need these things then the D800 is a disappointment, however for those who don't it's undoubtably a triumph of technology and marketing. Roll on a new D300s with all the things we need . I suspect our audience is small so I won't be too upset if it doesn't happen and will have to learn to just settle for the available cameras and lenses we do have.