While I understand the concerns about sparring, I think the comments about contact and heightened sensitivity are valid - and there's no reason why a blind person couldn't do everything else. And in reality, there's no guarantee that a blind person
wants to be a grappler, or that they'll be attacked by someone
willing to grapple.
I had a blind woman tell me she was joining my class (she never showed up) but I thought about a few ways to help her, and they ended up helping the students I had at the time anyway. I wanted a way for her to participate in line drills without someone constantly helping her, so I bought a bunch of thick twine, and taped it to the floor in lanes - when she didn't show up, I blindfolded all of my students and had them do line drills that way. It was quite a shock to all of them how much they used their eyes to aid their balance... in fact, it might be time to do that one again.
New techniques could be taught through a combination of verbal description and physically manipulating the person through the movements.
If the person uses a cane for guidance, it might be that an art that teaches the use of a staff would be highly effective - the cane would add reach and leverage, it's a familiar object, it's always present, and the person could sense contact through the cane.