Easier solution.
http://blogs.unimelb.edu.au/sciencecomm ... offspring/
Also, the use of infant formula to feed humans has probably knocked a measurable percentage off the overall IQ of our species. Sugars and Omega-3s are what make it through the barrier to grow developing brain tissue. That's why human milk is naturally sweeter than cow's milk. Sweetness of milk is directly correlated to brain/body mass ratio in mammals. Who knows what corn syrup does to brain development and the introduction of alien proteins in infancy is directly correlated with immune system problems including the sky-high asthma rates the health system is currently bearing.
Of course, the high negative correlation between education level of women and birth rate is also likely contributing to a decline. Not to mention the current practice of farming out much early education and care. If you think a genetically high IQ two-year-old in a daycare center gets as much mental stimulation as a similar two-year-old in the direct care of one of his high IQ parents, then you have never worked in a daycare center. Etc, etc, etc. No need to look as far as genetic engineering to find unintended consequences of modern technology and lifestyle.
I would also note that recent genetic research seems to lend credence to the notion that what allowed us to finally make our way out of Africa and spread all over the planet was the result of around 300 matings between human males and Neanderthal females. The Neanderthal species had already spread and adapted to more Northern conditions prior to the interspecies sharing of genes. So, nothing really new under the sun here.
Also, there is some evidence that an important component of genetic intelligence is found on the X chromosome. There is stronger correlation between maternal intelligence and intelligence of male offspring than other possible combinations. This may be a good part of the reason why there seem to be more high genius level males than females. They are occasionally thrown off by females of varying mediated levels of reasonably high intelligence. Therefore, removing high IQ females from the mating pool will likely have a more catastrophic effect on the comprehension level of future generations than removing high IQ males would cause.
In conclusion, the future of the human race largely depends on high IQ females with curvy figures, so everybody ought to treat them very, very well.