I think there are more than enough higher income people who would pay 5k just for a thing to watch a movie in private, with much better immersion than any alternative, on a plane.
As someone who’s worn mine to watch movies on multiple flights, the problem is two fold.
1. The device is ridiculously hard to get into “travel mode” on a plane. Especially if the device was powered off previously and you have to enter a passcode. Each time the “tracking was lost” notification is shown it forces you to start over with your passcode from the beginning. Those who believe in better security than a four digit passcode are brutalized. Then just getting control center open and selecting travel mode (needing like five pinch operations) can be insult to injury. I can’t imagine going through that in economy in tightly packed seats. After going through that experience twice, I now insure it’s ready to go on the ground before boarding, but that’s also a hassle.
2. Wearing the device for the length of a movie is still a struggle. I have a ton of time on other VR headsets (which I also can’t wear comfortably for 2hrs), so this isn’t just a “getting used to it” thing. Unlike the previous problem, this one isn’t really solvable without different hardware.
That said, once the movie starts, it’s the best movie experience on a plane ever for the first 20-30min.
Too much to ask for the average user, but the problem can be mitigated by the individual.