While I am not blind, and thus I cannot imagine what it is like to be blind, blindness doesn't really have the community aspects that deafness does... ie, I do not believe there is a such thing as a Blind culture (I could be wrong, though). While I certainly would not question that on the social level people who are blind would enjoy the company of other blind people perhaps more than seeing people, but I would say that since the language barrier doesn't exist with people who are blind (written communication yes, but not speech), blind people are more apt to feeling as though blindness is a disability, whereas deaf people enter the world with a language barrier and often come to dislike interacting with hearing people because hearing people generally communicate in speech and hearing people can't hear.
Since blind people do not experience this language barrier, there's really no impetus for blind students to want their teacher to also be blind.
Deaf and hard of hearing people, however, have a different situation. Since we can't hear all (or any) of a hearing person's speech, communication requires an interpreter... Which generally doesn't do anything but make the situation more complicated. Thus, we can conclude that it would be better to have deaf instructors. The problem with this is the fact that deaf instructors are hard to come by. The number of deaf kids is increasing very rapidly... And there simply aren't enough deaf teachers to go around. :\
I think that, eventually, as more and amore deaf people become educated at Gally, CSUN, or NTID, and more people become comfortable with being deaf (even if we're OK with it, among the total of all dhh people, we only number about 10%... most people have a problem with it and deny that they are dhh even though it's obvious to everyone else), the situation for deaf students in primary and secondary schools will improve and slowly but surely deaf instructors will replace hearing ones.
Will this happen in our lifetimes? I have no idea. But I hope so.