Hmmm... the research smells a bit of status-quo bias, or? I always think of Richard Feynman when thinking about super-intelligent people who are not socially awkward -- if we could raise average intelligence to his level, that would improve this world, or?
Whether there's an evolutionary (ie., reproductive) advantage is not so clear - but humans are not limited by that.
Just thought you guys should know about this. Some work that argues that humans should not enhance their intelligence with technology, and that super intelligence probably never evolves.