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I'm still not sure I understand - what has that story got to do with this topic? Are you worried about us killing off our 'pure stock'? Because that's simply not happening. If anything, it's going the other way around, with a much wider, and more diverse range of human genetic material being passed on to new generations. 'Perfectly good' humans generally don't get aborted. And the reproduction of 'damaged' or 'defective' humans is a good thing for our long-term survival in terms of spreading out our genetic diversity (consider examples such as the correspondence between sickle-cell anemia and immunity to malaria)
No easy answer? What's the question? There is no problem. Humans, no matter how connected or not are quite capable of evolving into new subsets - but, according to the nature of the way evolution naturally works, we are currently exploiting a period of smooth fitness landscape. This process allows for future fitness maxima to be more effectively reached once the landscape roughens up some time in the future (due to meteorite, nuclear holocaust, ebola pandemic, global warming, or some other arbitrary catastrophe) Evolution is doing perfectly fine, thankyou very much.
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