[higherpurpose]

I think the re-focusing stuff is mostly a cool-looking gimmick that not many people will take advantage of. Instead of doubling their camera budget to buy 2 cameras, I think I'd rather have them pay double for a much better camera, and be more competitive with the best mobile cameras on the market, today.

As for shooting 3D with dual-lenses, I don't think there are many applications for that right now, but perhaps there will be in the future.

If for example recording video in 3D will make it look much better when watching it later with a VR headset, that could be pretty cool. It could also be used for creating models/avatars of yourself, again probably most useful in VR worlds/games, and other stuff like that.