Boy I got in on this one late, and I am not reading 16 pages of replies, so if I'm being repetitive, sorry.
First off, I don't buy any of the "paying for the sins of our fathers" crap. My direct father did a lot of idiotic things that quite honestly I never want associated with, and I sure as hell am not going to right his wrongs, of feel I have to be for the ones that he might have wronged kids or grand-kids. It's idiotic say that the past gives them the right to a double standard. I can feel for them all I want, but when collages lower standards for this, and for what? Slavery itself was ended more then a hundred years ago and while segregation held on far longer then it should have, no one under the age of 40 have much experience in it.
Now I'm not saying that racism is gone, after all, making stealing illegal didn't stop that so thinking someone is going to accept others just because it's not legal. The funny thing is that as I go about my life, I've noticed that at this point there are segments of all the races that have a permanent looking down for other races and I get tired of being the only one that it's considered bad.
As for movies, I do think that diversity isn't a bad thing, especially for ones based on material that started when segregation was still about, or at least the mentality of it was still a lot more common. The examples in the Marvel movies prove this well. Hell, I wasn't one that was bothered overall by the idea of casting a black guy for the Spider Man Reboot. There is a lot of far more important things I think of for a super hero then there race. It's far more important that Spider man is a nerd (well, Peter anyway), Nick Fury is a bad ass and... arg.. can't remember the name of the guy in Thor, but for him, it was that presence of don't mess with me (and alot of that is in the eyes). Those are the traits I think of, not there skin color.
I think that the only time that I'd be bothered by a race change would be if it's a movie about a real person. For an example, I'd be wondering what the hell if they put a black man to play Andy Kaufmen in Man on the Moon, no matter how well they auditioned. I'd say the same if they had a white guy play Ray Stevens in Ray as well. Biography pics should go for what is as close to the subjects that there talking about, and this should include race.
In the end,like said in the video, it's not a perfect world and nothing is going to change it, so it's more just dealing with things as they come.