After reading the posts in this topic and a few days of thinking about it I started to see things a little differently as far as this "goofy setup" with the differing dual memory card specs.
The CompactFlash Association in early 2003 set the specification of a CF card at 137Gb and up to 1Tb in the future, but realistically, has anyone seen an affordable CF card greater than 64Gb or 128Gb let alone any that can match the speeds spec'ed out for the new XQD card?
And according to that document, it's not only Nikon that is interested in the format but the chairman of the board of Canon has also chimed in as seeing it as an evolution of hardware.
Seeing Nikon introduce it in this way is probably one of the best ways to give the new format a chance to be introduced and possibly thrive. What better target to get to put it through its paces than professionals and serious enthusiasts?
If Sony were to introduce this to a smaller target audience or to a new camera line exclusively like one of their own wihtout mixing the formats with a dual card camera the chances of it getting adopted or even becoming succesful is nil.
A worse thought to force this format on their target audience would have Nikon completely ditch the CF format and have a D4 with Dual XQD card slots, and possibly forcing format on all their new higher end cameras. Where would that put you or the rest of the community with CF cards that can't be used if they did this?
This is a transition. Sure, maybe they should have done it with a D800 and not their flagship pro camera body. But think of it this way, if you were the developer of the format how else would you have put it out there in a higher profile, to your target audience?
Doing it this way, you introduce a technology, but not totally destroy a move forward.
The CF card is slowly reaching a limit. As these cameras evolve to higher megapixels, longer video recording times, the need for faster recording of data onto the media a format will need to be met. Doing it now instead of later can make the current format cheaper if they are no longer going to make any tech advancements on it, and it can make the new tech cheaper later down the line if it becomes the new standard that we would all have to move forward to out of need. If something is not developed and introduced now then when, who, how and with what? Totally dismissing the idea will never give anything a chance and we would be stuck with 64Gb CF cards with a set limit while everything around it outgrows that limit.
This goofy setup allows us to use our current cards, and allows us to use, improve, and move forward to a new technology that will have to be replaced eventually.
Maybe Sandisk and Lexar say they don't have any plans to develope their brand of XQD cards anytime soon but you can also read into that as YET but will eventually. Maybe Sony is licensing the tech at a high cost at the moment and they are waiting for a better fee structure.
Also, wait for Canon to adopt the same format in the same way and things will probably start to move forward more quickly.