I think you're being too pessimistic. I think the American people are becoming more diverse and more comfortable with diversity, and I think what I see on TV reflects that. Certainly there is still prejudice and racism to be overcome, but I think the progress toward greater inclusion is building momentum, and we can help it along better by believing in it and supporting it than by sinking into pessimism.
I don't think pessimism
is really the issue. Being comfortable as things are
I would say is more the issue, and I think it always
was. Being a White male, things are very
comfortable for me in the American-racial sense. At least now. There are people today who are very uncomfortable, and the only solution is to push for change. The media as it stands now, has no intention of changing on it's own. It's as comfortable as it was prior to the 60's.
I wasn't alive at the time, but I'm sure Hollywood, and Americans in general were very comfortable with the black-faced minstrels, black characters who couldn't articulate well, and afraid of their own shadow. I don't think there was any intention to remove those character types at all. Those that were uncomfortable
had to take action to remove the discomfort. And the uncomfortable party is generally a representative of what is being stereotyped.
Like I think you indicated when referencing Obama, change came about partly due to a shift in racial population. There's always a chance that through time, things may change due to a minority population shift. But that's not to say that another minority group won't take it's place as far as media stereotype/racism.