No major, the IQ limit of human kind has been decreasing for a long time. Better alimentation and schools helped to improve the average IQ level on the werstern world until the 70s-80s, before the IQ peak lowering started to push down the average IQ.
http://www.dailymail.co.uk/sciencetech/article-2730791/Are-STUPID-Britons-people-IQ-decline.htmlEver since sendentarization of the human kind, life become easier, and by a process that can be related to Darwinism, easier life condition offered the weak (less inteligent) a bigger chance to live and reproduce then they had before and transmit their "dumb" genes to their descendence.
On another side, with better life conditions, smart people have less kids and later on. Therefore we have a highest ammount of dumb people by every generation with a smaller ammount of smart people.
Edited 4/22/2016 03:17:13