So I just saw Idiocracy, a comedy with Luke Wilson, and I found the premise of the movie frighteningly believable. The premise (for those who haven't seen it) goes like this:
Intelligence is no longer required as a survival trait for humans given our level of technology. In fact, it is now a hindrance to reproduction since intelligent people today are, on the whole, less likely to have large numbers of children (or any children) than stupid people. Thus, over time, stupid people will reproduce far more than intelligent people, and thus intelligence will gradually be bred out of the species.
I could definitely see this taking place in the more affluent West, but I guess the salvation of humanity is a) immigration, b) religions which discourage birth-control, c) eugenics and d) abject poverty.
Still, I've often wondered (after reading literature of former centuries) whether we are becoming stupider. Any thoughts?