There's a great line from Mad Men which is apropos to this kind of thinking:
"I don't know, maybe every generation thinks the next generation is going to be the end of it all. I bet there were people in the bible walking around complaining about "kids today"".
We're always convinced that society is going to hell in a handcart, and that the only thing that can stop it is by holding true to some ideal of the past. You know what? People are smarter today than at any point in the past. The pace of progress is always increasing, and knowledge begets more knowledge. No reprogenics, no "Gattaca" crap, nothing about how there will be a "smart" society and a "dumb" society, it's all crap.
You know what Einstein's kids were? Of above-average intelligence. Do you know what his kids' kids were? Average. Genius, bread down to average in one generation. Do you think it's because Einstein married some dumb floozy? Do you think his kids did? Nope. There's always a reversion to the mean. Smart only begets smart to a point, and never perfectly.
And, not for nothing, but why is it that whenever I hear about "oh, well, if society collapses, smart people will build back up" it's from people whose only conceivable contribution is in a post-industrialist world? Very few of us (and I include myself) could hunt down an elk, much less invent the telephone. We're only smart contextually. I can't talk about theoretical physics any more than I can talk about baseball stats, but the only reason knowing about one makes me smart and the other makes me a meathead is because of the side of the fence our collective on this site happens to land on.
Similarly, why do we conflate "stupid" with "asshole"? I've met many, many, affable, kind, considerate people who aren't as smart as I am, and I've met raging jackasses who are as smart if not smarter. In fact, I've known more smart assholes than stupid ones. So, let's bifurcate the issue: are we worried society is becoming "dumb", or that society is becoming "jerks", 'cause there are actually two different solutions.