I met a fellow on the reddit nootropics board who writes for the Bi-co news of Haverford and Bryn Mawr Colleges. He wrote an article on nootropics and, more specifically about the impact that he sees nootropics having in the future. His conclusions about the possible effects of these chemicals are pretty much spot on, I think. In terms of predictions about the impact of intelligence increase on a global scale are certainly something to think about. I contacted him about the article and he politely allowed me to repost it.
You can read the article in its entirety here: The Future Of Cognition by Devin Van Dyke