agree... kinda'
I'm not suggesting that apple is going change their interface because they're changing their website... yes, that would be "ludicrous".
What I am suggesting, however, is that their website (which was originally based on their new interface; which was based on their new hardware designs), will be changed to reflect the design of the hardware they are currently selling - sleek, slim, white (or "metallic" greys) and clean. There have been lot's of complaints about Aqua being too bright and colourful, and as an interface I have to agree. I love the cleanliness and simplify of OS9, but I also love the subtitles of what quartz can do. My guess is that, eventually, we'll see something that's a hybrid of Platinum and Aqua.
If I remember correctly, their website had the Aqua style before OSX was shown to the public (well, DP3 or whatever had the new interface). If Apple is to make a major design change to their website (and my guess is that it will, and it will look like their TiBook or something similar), I wouldn't be surprised to see the interface in OSX change as well.
Aqua as we know it was used to market Apple's new interface. Now that everyone knows what OSX is, I think Apple will take a slightly more serious and professional approach to their interface design... seeing as we've already bought (literally) into their vision of the "future".