That's a hell of a way to phrase the title of thee thread.
I don't know anything about this phrase persay- but it's rather restrictive to the superman thriving in only one economic model... if there is a earthquake that ruins the wealth, or a technological innovation that undermines the basis of wealth in a capitalistic system (capitalism kinda goes hand in hand with money), or a siege deprives access to wealth- then it's asif this species suffers a lost of a biological limb.... or at least heavily atrophied.... and is thus only as strong as it's socially recognized wealth in stratification of social position and the ability to control productive forces inherited.
This is just silly pointless- not even the most absolute and totalitarian of rulers do this, nor do most capitalist societies or dynastic harbingers of power hold to this exclusively..... emphasis on what glitters and moves men is obviously esteemed... but also the capacity to create new wealth, to attract new vitality, to cultivate and rejuvenate a new base as the older base fades in effectiveness.
Just holding to the dynastic needs of a merger of capital- though obvious with benefits, is a very poor plan for the hopes of modeling a class structure that leads to a new species- it's only going to be as effective as the vitality of what it merges in- and effectively becomes a slave to the needs of it's increasingly contradicting and yet ever expanding base- this is worrisome especially if this class has little actual relation in contact to understand and competently direct and inspire the lower classes in a said society- and contact necessitates in time allowances for behind the scene breeding- no matter how taboo it will happen- and thus you will NOT achieve a new species, but at best a sexually endogenous class/sub species of cuckolds holding all too much power and the only capacity to genetic ability to produce offspring capable of seeking insight comes from the vitality of those exploitative managers who worked their way to the top who may ormay not share some of the desired bloodline (lesser nobles- such as the Junkers of Nietzsche's day- mixed with other bloodlines but alwyas noted their lineage to some high ranking ancestral source- some were rather naturally questionable in their claims- for every protection they had, they faced as many problems in maintaining and succeeding in expanding their estates and petite powerbase- the really successful and lucky could work their way to the top of government- the sexual oddities of those in high offices of power and the oddities of cuckoldry in cultures that marry inside of the family/clan to outsiders is well known) ..... however, this will forever remain just a subspecies- for once segments of it reaches a stage where it can no longer reproduce with humans.... nor have to face the selective Darwinian stress- they are going to die off or be sidelined FAST. Little things are going to knock them off left and right.... even a dim and slow human possessing considerable sloth is still more than a match enough when given opportunity, surprise, and motivation- no matter how poorly thought through- to exploit these ever dimmer, exhaled idiots. No class structure last forever..... men just are not THAT into the norms of tradition.... it loses effectiveness as time change..... and times will ALWAYS change.
Yes- a narrow genepool will lead to willing cuckoldry.... sociology has noted this.... I can already hear the cries against this here.... but it's rather true and long documented since the time of Machiavelli's Travel to modern Anthropologists..... this would have to be overcome somehow.... and I severely have doubts about this happening using all known methods man has tried up to the present to control the sexual urges of themselves... much that of their distant offspring.
Now.... this being said- I would be very interested in seeing what the genetics and mentality of a fluid class of coordinators and managers and ministers in a said society would look like- a good chance for them to attain and carry forth the best genes of both sides- the aspiring lower classes successful in war and business.... and that of the ruling cliques. This has a far better chance in a monetary based society to produce a new species (ironically spreading the best genes even down to the lowest- thanks to bastard children, affairs, one night stands, as well as just the progressive decline of particular branches of the nobility to the bottom to the point where intermarriage with the lower classes becomes a necessity. I am a friend for example with a Sforza- she held a very strong resemblance to that line in racial features... but was in the exact same economic class as me.=, and could of very easily of been a sexual mate had we been inclined.... her particular branch didn't maintain it's ascendancy for whatever reason.... but still carries the seed and potentiality of thier ancestors. We all do- we are all the son's of kings- but it's well known the higher classes are more vocal about their lineage and have a necessity in tracking their ancestry from one notable figure to another. If only we could read the story our blood carries- there would undoubtedly be a massive reorganization of power as people aspiring beneath would get massive vindication to their claims, and some of the dunces above would realize how much less equipped they are by the barreness of their darwinian proven ancestry- all too often we inherit a leader who landed by pretending or by the relative luck of circumstance that catapulted them and their blood to the top.
So to sum it up- the hope to base a race off of money- money which has a element of pretend to it that everyone has to go along with for it to work- becomes a fish out of water in bad or cataclysmic times.... and is going to result in ironic shifting of needs to maintain it's ever narrowing genepool that will lead to culkoldry and bastard children that will do everything to ensure that a new superrace will not arise.... at least not exclusive unto itself apart from the bulk of those it carries beneath it class wise. You will need a massive and very widespread population of either a poorly traveled and sedentary nature or a nomadic but shortly traveled population to even hope to achieve many contemporary species of man..... the urge to breed knows no bounds, so you will need natural or effective man made barriers to ensure this. But why would anyone care to do this just for the sake of doing that is beyond me.
Makes me remember Nitz crush wanting a threeway.

As I said, oddities arise when wealth and power mixes..... and it's potential carries down to the descendants. She had quite the mind and was a looker.