See my response above. Did not mean to suggest we should all start waving our cameras. Something could "wave" internally, or this waving isn't even needed of Canon came out with a microlens-adaptor.

By the way, there are several apps already which build 3D scenes from two separate pictures. Some can even generate 3D models. HDR used to require manual exposure bracketing in phones too. Now technology has caught up.

Correct me if I'm wrong, but the Lytro stereoscopic field looks fixed at a relatively short distance. At the moment it seems to be a very subtle parallax effect, one that might be mimicked by an ever so slight movement of a camera sensor.