Evolutionarily speaking, it makes sense that the human race doesn't have other minorities or races. Most early human tribes in Azeroth, known as the Azotha, were nomadic tribes of hunter-gatherers with culture not unlike the trolls. However, during the great sundering, most human tribes were wiped out. http://www.wowwiki.com/Human

This created an evolutionary bottleneck where a great deal of human diversity may have been wiped out. Consider this, before the sundering there may indeed have been several different non-interbreeding tribes of humans: darker colored, lighter colored; every shade of human pigment we know today. Which means that these pigmentation genes were being passed down through generations. After the sundering, perhaps a race of darker skinned people were wiped out (don't read too into that you overly sensitive people) meaning that those GENES were wiped out. Then the only gene pool humans have left to choose from are the lighter skinned humans we see today.

As far as the perpetual youth thing we see today, I like your idea about evolutionary selection weeding out people who are sickly, and unfit for battle. And maybe the tribe that wasn't wiped out were the tribe of really curvaceous women and blocky men. :P

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