I've never known anyone personally in the industry who is deaf/hard of hearing, but I think that's something that can be gotten around. One thing that might frustrate you would be teleconferences, but I'm sure there are ways of adapting such meetings to your needs, and companies are required by law to make such accommodations for employees with such needs. The rest of communication with out-of-house people (authors, external sales force, etc.) could mostly be done via email, or TTY if necessary.