A killer app still isn't a guarantee that VR will be "the future". Nintendo had a killer app with Wii Sports, and nowadays they can't shift a console. No one cares about motion controls anymore, as Microsoft discovered very quickly. And yet VR tech is trying to bring it back.
The problem with VR is that once you get past the cool factor of looking around a virtual world, you realize you can't really do much of anything. Turning your head to look around a virtual world is cool, but why make the effort to turn your entire head when you could just move your mouse a few millimeters? Motion controls had the same problem. Cool for a bit, but it's a very limited control scheme.
VR has fad written all over it.