Having been an Eyetoy owner, I predict about a month :)
Eye-Toy only had like.....4-5'ish games that actually *used* the thing as the main controller and not an add-on gimmick.
(not to mention the annoying room/lighting requirements)
Steven Colbert sais the Wii is a great toy? hey guys, I know which console is gonna win the next-gen battle!
That's what I thought when I first saw it, said to myself "Nintendo owes Mr.Colbert a good sum of money for the extra 50k people he just put in line for one......".
Nintendo is getting waaaay too much free advertising.
(and I barely see their onwn one of two Wii commercials on the air {in North America} as is)