The superhuman urge, as I see it, works to spite human nature. I think a proposition such as 'Man is not made of fire,' is undeniably a part of our human nature. Or, when you say, that, given a 100,000 years, we may not recognize our descendents by our current notions of human nature. That's the whole point. The limits of the imagination are a pisspoor starting point for the definitions of Man, methinks.
Man is a freak of nature.
Superhumanity is the segment of the population who would like to exaggerate this freakishness, this tangent to the cycles of Nature and the circles of life. Voting in general, toothbrushing in general, felching in general. Actions, judged in small bundles, that clash with the chorus of praxis, or atleast offer a significantly different melody. Actions that screw with praxes, handling structure as you might jazz scales. But, life is not so bleak for that 67.3 percent.