Airlines should rent these, already set up for movies or whatever. I'd pay to give it a try. I wouldn't want these taking up my carry on space going to and from the airport or to deal with security, so that's another advantage.
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That said, I am a little surprised the Middle Eastern and Asian airlines haven’t adopted these for their international first class cabins (your Singapore Suites, Ethiad Apartments and the private rooms on Emirates).
There are already tons of places you can go and rent time with VR. Or even just 3D movies and experiences where you need special glasses.
Airlines already have reusable noise cancelling headphones and drink glasses in first class.