They needed a gimmick and they found one. i don't see how this is at all blatantly offensive, but it does play into the human psyche and how we're all conditioned to believe that we're all created equal. Then again when they do a men vs. women type of competition no one raises and eyebrow; but separate races... what kind of a society is this!
I say if the participants are willing and it's just game (which it is) no harm no foul.
That said, i've never had any interest in Survivor before and I still don't.
If you're a battery, you're either working or you're dead....