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Still strictly better than the current situation.

You're perhaps underestimating vision scientists. If the problem is a driver (or something else that doesn't require a surgeon), I'm not the only person who might volunteer to develop the driver, given the alternative of people returning to blindness.

Untrue. Even small communities have shown to be able to do maintenance on whatever piques their interest. 250 customers with a high stakes product is large enough for them (or their insurer) to collectively hire say one programmer and one mechanic. That would be more capacity than 50% of FOSS.