All others must be sterilized and eventually eliminated, so that the only genetic line left is that of the elite.
This idea seems to have been the main thrust of the ruling class's attempts to mold world society to their liking. Take for example the following article:
http://www.lewrockwell.com/gatto/gatto-uhae-2.htmlYou can see that the main goal of the public school system is to sift worthy breeders from those who should not breed. Also, I once read that the Nazis took the death camp system from an American proposal circa 1900 to kill most of the population, leaving behind only the elite.
Now I personally am wholeheartedly for this. I think that if most of humanity was eliminated, leaving behind only the ruling classes, that it wouldn't necessarily be a utopia, but that a much smaller genetic pool, tilted towards those of superior intellect and money making ability, would result in a better world. The Nazis were trying to achieve this, and the official rejection of Nazi genetic beliefs in modern America is problematic in that those beliefs were mostly correct. If autistics are not allowed to breed and are wiped out instead, what happens then? If everybody is killed off except the ruling classes, wouldn't it be a better, albeit smaller and more intimate, world? The problem then becomes how to kill 7 billion people in an efficient manner, and how to dispose of their bodies.
But if the ruling elite killed off everyone else then they would no longer be the ruling elite. Who would they be ruling?
Eugenics was tried once but since hitler it was swept under the rug. Plus eugenics doesn't take into account nurture and life experience. Also it went on the assumption that only "good" genes could produce "good" genes. And there was no description of what was "good". It was a movement that grew out of ignorance and was extremely premature considering that proper eugenics would require a complete and solid understanding of our genetic make-up. The movement started before DNA had even been discovered.