You need to understand how the viewer perceives that 3D. Often it plain broke, like XMen where a tap in the foreground was all blurry due to camera DOF. It was a very unnatural experience. Films also use 3D perspectives that don't match human vision (eg. wide angle lenses with human eye spacing) and it's just weird. Given the increased price of 3D movies and a general inferior experience due to uncomfortable viewing and darker images, it's not surprising people didn't take to 3D in a big way. Sony are being sensible regard VR and realise they need the right product that has a sense of wow, and doesn't quickly become a tired, unpleasant gimmick. FPSes designed for the 2D screen will be unlikely a great a fit for VR as much as a 2D film shot in stereoscopy often made for a poor 3D experience.