Well good news then! The future of VR is here, and you can already watch movies, educational lessons and virtual screens at your desk, bed or sofa. You don't need a headset to do that, even. You certainly don't need to spend $3,000 on it.
The problem is, none of that stuff is appealing. It's not only not a killer app, it's not even a profit driver. Games move some units, but even that is arguably clunky when you're not fully leveraging 6DOF.
So, what's the point of making a mobile headset that's not intended to be moved around? Why tether a headset that could be plugged into another machine altogether?
That's if you're primarily into gaming which Apple isn't.
I suspect the future of VR is going to be at a desk, sofa, bed etc. with virtual screens, meetings, educational lessons, movies etc.