Technically, the New Nintendo 3DS models used camera-assisted orientation of face-tracking for its 3D effect to improve the look of its 3D screen. So it sort of did get used, once...
https://arstechnica.com/gaming/2015/02/new-nintendo-3ds-xl-review-return-to-the-third-dimension/
Still, it would have been cool to see this effect used on a big-screen game too, as the pseudo-3D effect is pretty convincing and exciting in the demo here. (I'm not sure how well it would convert to a normal polygonal scene, as it's dependent on the player moving around a lot to create their own sense of perspective, but I've always liked the effect he achiveved.)
3D in general, I'm actually sad it went away. Sure, it was a gimmick, overused and overpriced (although my 3DTV was about the same as comparable displays, so I feel like the markup wasn't always out of control?), but TV manufacturers gave up too early and now aren't even offering options for those who actually like 3D. A 4K 3D video stream would be much better than the previous approach, and while passive 3D adds complication to the TV manufacturing (though I like it better), active 3D is AFAIK just a matter of synching the TV with the glasses, yet no TV offers it. And same-screen multiplayer was a really cool feature that died with just one use but is technically as easy to implement as split-screen.