The same way that people remember POGs or Beanie Babies. Everyone was crazy it for a year or two, and then moved on and it will be endlessly be the butt of jokes.
Everyone was acting like motion controls were the next big thing, when they barely worked. Setup the sensor and calibrate the remotes and they still only work like 80% of the time. They were implemented so poorly and for some reason mandatory, they really were just shoehorned into everything no mater if it made sense or not. That shallow gimmick got tired fast.
Where are all the motion games now? We got gyro aiming on a handful of titles and that is mostly it. Funny enough modern controllers have motion controls baked in without needed any extra sensor and they are much more accurate, but those features are hardly used. Motion controls hit a dead end. Nobody wants it.
Nintendo put out some good software, no doubt, but if it wasn't by them, the quality went off a cliff. It was really lacking in big third party games. Wanna play Red Dead Redemption, Skyrim, Dark Souls, Bio Shock, Mass Effect, or any other games that really defined that generation? Not on Wii. But don't worry there is piles and piles of low quality shovelware sitting in a landfill somewhere.
If Wii should be remembered for anything it should be the Virtual Console, which really sparked an interest in a lot of people in getting into or back into old school games. And WiiWare which helped grow the indie scene to what it is today.
The Wii also lacked HD and had terrible online, so your experience was always going to be less than ideal. Everyone had a Wii, but after the fad, they just ended up collecting dust under the tv or in the closet.