Imnus said:
Timeframe on its own is not that important for determining if something is a fad, of course it should be relatively short. Relative meaning compared to similar products. |
Wii had a longer lifespan than the N64 and the Gamecube which are similar products. Just look at the data (which is missing the last year of Wii shipments).
Tamagotchis were released outside Japan in 1997 and sales were down big time in 1998. Of course going by total sales it's up, but that's a result of the staggered release, not because its worldwide popularity lasted two years.
There's even a Pet Rock pic on the wikipedia entry for fad and they have their own page so I guess they are.