I must admit that's a very persuasive argument you put forward. File size isn't a big deal, although maybe work flow on my laptop may be a bit slower when working through 500+ wedding photographs with 36MP image files?
I have to say noise hasn't been a problem for me.... you would have to 'pixel peep' to see it and with the launch of Lightroom 3, the noise correction algorithm was much better than previous releases. It does a great job of taking it away (if it becomes an issue), although I do accept it's better if it's not there in the first place!
Battery life will be another small issue, but again not a major obstacle. I'll certainly watch developments with interest as the D800 rolls out