So you agree you were incorrect about Photoshop's file limitation having any effect on the handling of D800 images, and that Photoshop can easily handle the D800 file size? And you agree that reducing the file size as discussed is trivial as we've pointed out?
If you don't have a computer with good specs you're not going to be able to run a program like Photoshop CS 5 Extended or regular edition, or Lightroom 3 very well any way, even with a smaller file, such as that which you get from a D700 or D7000.
I guess I have a higher opinion of our members than you, as I think they are smart enough to understand that more MPs mean bigger files and bigger files mean more powerful computers with lots of RAM are the order of the day, and that if they have a marginal computer, it will be somewhat more marginal when handling larger files. Before you jump on the next reason for not upgrading being the need for more storage for larger files is necessary, I'll bet Nikonians all over the world understand that too.
I've got a 4 year old computer with 4 megs of ram and it's doing just fine with CS 5 extended, handling 70MB image files, and it even did well with that 85MB image I mentioned. Sometimes I even have 3 or 4 of these files open at once. I guess with a 100MB file, I can only have 2 or 3 open at once.