You don't even need to be fully blind for it to be untenable. There's a broad range of sight/eye issues and other issues that make VR a non-option for what I imagine is a not insignificant population. A lot of able looking people with 20/20 vision walking around with non-obvious problems that can be managed effectively in day to day life but strapping a self lit screen centimeters from the eye...

I'd like to read on that a bit, I haven't seen it talked about much.