I think you're overestimating the tech. We've had these features in VR already for the better part of a decade; sports, tv, games, floating apps.
The problem is two-fold:
The tech apple is developing is way too expensive for their target demographic.
VR is a novelty like 3D movies.
I say this as someone who owned the original HTC Vive and subsequently a Oculus Rift (and 3D tv and projectors).
If VR is going to be mainstream, it's going to be because Sony or Microsoft push it through their console market.
TL;DR
It's going to take a lot more than a great App to sell their multi-thousand-dollar VR experience.