The answer to your question about media studies graduates perpetuating stereotypes and media values is in my opinion answered by the fact that they are studying media studies in the first instance. The study of the subject is indicative of a likelihood that they innately value media as a medium, upon graduation they are therefore more likely to perpetuate the values than try and alter them. I am of course making a generalisation but it makes sense as a general statement about your average media graduate.
Seeing a blind person on TV or seeing deaf people communicating with each other or seeing a person in a wheelchair should be normal - showing life as it is, but life is often shown on TV in a very different way indeed secretly prejudicing disabled people.
In fact, the only disabled people portrayed on TV nowadays are paralympians. But Disabled people can be fashionable, beautiful, trendy, sexy blah blah too. Okay. So I've got that out of the way. Now Black people...Cut. :/