However, smart people will always continue to have sex with dumb people. The size of a woman's brain is not what catches a man's eye from across the bar. Well actually, maybe her frontal lobes...
Good heavens! You’re not falling for what Sowell, in “The Vision of the Anointed”, calls “quotient hysteria”. You take a “statistic” (in this case, an absolutely unsubstantiated proportion) and extrapolate it into the future and, voila!, you have yourself a real crisis”. Usually this is applied to things like natural resources (we’ll be out of oil in xx years, out of tin in yy years, etc.) or more recently to climate (the earth will warm up zz degrees in nn years, ice will melt and we’ll all drown), but this guy seems to view humans as just another “resource” to be managed. I’m surprised he doesn’t propose we prevent the emergence of separate “breeding stocks” (!) by forced interbreeding -— but then I suspect he’s not exactly an egalitarian.