Nietzsche was the last of the great philosophers -- and perhaps the greatest of them -- to live and work before the truth became so perverted, distorted and degraded by the time the twentieth century arrived and wore on. He and Bierce were truly the last exponents of master morality, after which time reality became filtered through a lens of shit.
Nietzsche emphatically did not mean for his concept of the "superman" to be construed as an evolutionary phenomenon.
As Nietzsche said, man is something to be overcome. And one way or another, he shall be.
As Bierce and Nietzsche have noted, if you are a sedentary people and are going to have a social hierarchy, you may as well bother about making it a proper one. They stop short of calling their suggestion one of a meritocratic aristocracy, but this is what they mean. As in a range of mountains there can be only one tallest peak, so should a society be governed by its best man (or men). The various stations should be assigned according to measured actual worth (hopefully allowing some leverage for choice of occupation among a set of prescribed options). They note wisely that the best governments have been those of strong enlightened monarchs, and the greatest cultures exhibiting the highest degrees of civilization those of an aristocracy of men who are aristocrats for good reason. What we have now is the product of what Nietzsche might call the pinnacle of the development of "slave morality," in which debasement and weakness (or hatred of the strong and dissatisfaction with this life) have, over the centuries, been inverted, turned into virtues, and institutionalized as what is believed to be the best form of human society so far. The reality of course is that modern civilization is the advanced and advancing stage of a period of utter decadence and profound decline which just such an aforementioned scheme would be structured to prevent as much as it is possible to do so. At any rate, we could be doing much better at the task of civilization than we are now, with a little conscientious thought and, admittedly, rather radical (and hence totally improbable) action.
The great irony is that we today regard the past as the dark period, when in fact the God-death of previous centuries has ushered in the true dark period. Much genuine wisdom of the past has been utterly lost.