Truthfully, the elites like Bill Gates, want to eliminate, not replace, most of the world's population. This is to allow Mother Earth to heal and return to a more natural state for the enjoyment of the elites.
For very enjoyable reading (fiction) that lays out how the elites intend to accomplish this, and why, read Tom Clancy "Rainbow Six" and Michael Creighton "State of Fear".
Not a bad idea really, but very arrogant on the behalf of physically inferior people.
