Yes. There are good arguments supporting the idea that natural selection is reduced in human populations because of our ability to modify our environs for comfort and to support those with disabilities. Also poor people are having more children than wealthy and educated people on the planet--how this will play out is yet to be seen.

If you haven't seen it yet, the movie Idiocracy takes a humorous look at one possible future in which people are dumbed down over generations. It's from 2006 and it wasn't well recognized (by me at least) at the time. http://www.imdb.com/title/tt0387808/