Nintendo is far from the best company in the industry. Have they done the most for it? Sure. I'm not going to argue that. But that doesn't make them the best.
You are right. Sales numbers don't lie. It's why Nintendo has caused a shift to a focus on motion control. A technology that is still imperfect. It's a fun gimmick for some games, but for some games it just doesn't fit. Some of us would prefer a controller to something we're supposed to waggle.
There's always the classic controller. But on Nintendo Consoles, Nintendo always makes the best games for it. And many of their games aren't compatible with the controller.
Zelda: Twilight Princess - does not use the classic controller or the GCN controller. If you want it, you have to go the Gamecube route.
Mario Galaxy 1 and 2 - Again, not an option.
Metroid: Other M - No classic controller here either
Donkey Kong Country Returns - Again. Not an option.
Kirby's Epic Yarn - Oh look. Nope.
Many non-casual gamers don't like the shift towards motion controls. And it's spreading fast.
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See You In Another Life, Brother.