It looks like the game is moving systems as well, at least in Japan
(link): apparently the difference between GC units moved and PS2 units moved last week was only 1,000 units, which is unheard of.
Re: the impromptu straw poll of who owns what console--I don't know anybody personally that owns an Xbox, I know two other GC owners, and plenty of PS1/PS2 owners. I think there might be a somewhat higher correlation between people who post on gaming boards and Xbox owners than there would be for people who own other systems, which tend to appeal more to the casual gamer. Just as people who post on gaming boards are far more likely to be in favor of online console gaming--outside these boards, I don't know anyone personally who has even the slightest interest in getting online with a console.