Now who are you talking about Nintendo or its competitors. The actual hardware for the Wii was outdated by 3-4 years now even before it was released. The only things that are not outdated on the Wii are its perepherials example Wiimote etc. MS and Sony's systems were not outdated before they were released. These machines produce(d) console games that have never been done before when it comes to graphics, sound, frames per second etc etc. The Wii specs are equivalent to like an xbox
and the games are much worse.
Really, you believe that. Non gaming kids and adults will continue to buy peripherials and consoles. Its like saying "non audiophiles" will continue to updgrade their home theatre system every year or so. That is a bit of a stretch. Do you think mommy and daddy will continue to buy consoles and expensive perepherials and games for their kids...not likely (perpherials are expensive, games are not cheap either). Eventually mommy and daddy will realize how expensive it is to keep the Wii current...it adds up...probably the most expensive system if you really want to play everything on it.. However it is not a stretch to say that hardcore gamers will continue to support new consoles. Just look at the history of this industry. This is a much more stable market where the consumers have $$$ to spend on these such things.
Nintendo's approach to the future is a very risky one. All fads eventually fade away.