There has to be a better way to do head-tracking 3D. I'm all for the tech, but I see no reason to let it "scan my living room" or what have you. There's also a limited benefit unless you have a large TV and you're mobile during gameplay. This might be cool for fishing, golfing, boxing, a sniping game, etc.; but for most things where you're reclining on a couch and playing with a regular controller, I just don't see it.
That said, after the New 3DS, I was really hoping to see something like this become standard on Nintendo's next handheld. They'd already done eye-tracking, the feature would be cheap and easy to add to both hardware and software, and you'd be a lot more likely to tilt and move a handheld screen then move your head around to look at your TV. It would have been so easy and would have had such a big visual impact, especially for 3rd person games. Alas, the Switch dumped its forward facing camera so no dice. Maybe the Switch 2 will make a different kind of glasses-free TV its gimmick, but I won't hold my breath.
EDIT: I'm glad you brought it up. I've been interested in head-tracking 3D since
Johnny Chung Lee was doing his experiments with the the Wii. I'd like to see someone really go for it.