It was interesting to read in the paper about one expert's theory that the human race is in the process of evolvig into a ruling class and a sub-species of shorter, less intelligent folk. While it turns out the 'expert' proposed this theory for the fabled institute of scientific excellence that is Bravo TV, you've got to wonder whether he may have a point.
To use a mobile phone metaphor: we all started out as those clunky phones which MPs/prominent businessmen/James Bond had in their cars from the 1960s. Those genetically superior Vikings at Nokia defined the populist mobile phone in the mid-nineties with the 5110 and 6110. The introduction of the 9 series was the genesis of modern business phones and saw the mobile market properly split for the first time as larger, clunkier phones with many more features were created for the business market. The decade since has seen two major types of phone develop (here's the point): the pretty, lightweight and feature-free phone aimed at texting teenagers and the heavyweight business machine, a la blackberry, psalm etc. There are hybirds, but these are not the most popular phones by anyone's standards.
Personally, I reckon that the human race will destroy itself long before we have a chance to divide into superior and inferior sub-strands - the evidence for this is all around us. Also, random factors will always crop up that stop the beautiful/intelligent types breeding with each other. For example, the national lottery. You can bet that lottery winners are able to punch well above their weight with the opposite sex, purely because of the downright attractiveness of a pile of cash.
Either way, sub-species should be the least of our worries. First should be global warming, while a close second should be Watford's survival in the Premiership. Up the Horns!