I was thinking one way for people to afford them would be to accept ads. I would hate that, and I think I'd just wear glasses or normal contacts.
In fact I'd be much more attracted to this sort of thing in glasses, because they'd likely be cheaper, and glasses can probably support more functions. And you wouldn't have a radio receiver concentrating radio energy directly on your eyes.
Also this is a thing that goes in your body, and the FDA might have something to say about open source in that context. Is there any open source software running on pacemakers at the moment?
I think there are many more issues involved than simply "it's my hardware and I'll do what I want with it." If we get better eyeware through open source then great, but I'm skeptical at the moment that it can, much less will happen.
Actually, that's kind of my point more than yours. It isn't as simple as a knee-jerk "it must be closed source". You argued black and I argued not-black; not-black isn't "white", it's white and the greys, too.
New devices are much more locked down than they would have been a decade ago. That's not an accident or a fad.