Dude while you may be correct that real geniuses with vision have probably stayed at the same level when I was a kid we at least had a high percentage with what we called "street smarts" or basic common sense, now we seem to be creating people that are too fucking stupid as to even understand basic cause and effect, see the woman who fed nothing but Mickey D's to her kids for a decade and then tried to sue because she didn't know a decade of 24/7 fast food would make kids fat and diabetic as just one of a billion examples I could post here.
Maybe its because when I was a kid any woman that had a litter of kids by different men would have been looked upon as a whore and the guys who fathered those kids as worthless scum if they didn't step up but you didn't see the whole "half a dozen kids with half a dozen dead beat dads living like animals" shit like you do today. Hell when I come back from my babe's place, even late at night, I had to dodge kids just running loose like dogs, its seriously fucked up man, and its no wonder we are breeding so many dumbasses when you have kids that aren't being taught shit and left to run loose like animals needless to say their little brains are gonna get exactly jack and shit for stimulation.
At the end of the day you could take the smartest baby on the planet and put them in a house where nobody bothers to even talk to the kid and the babysitter is reality shows and they'll grow up to be just another moron on the march, you have to put in real effort and do the work when it comes to kids. I should know as I raised my two nephews as my sister lay dying and her ex, their father? Idiot. yet they are both HIGHLY intelligent and I would attribute that to constantly giving them new things to learn and do, if they wanted to play a video game? i would show them how the game was made, so that they knew how everything worked, i even let them build their own PCs at 11 years old, explaining how each piece they were installing worked and how the ones and zeroes were turned into images on a screen.
Maybe I'm just old fashioned but unless a kid has brain damage or some other mental defect if a kid ends up booger eating stupid i tend to blame the parents. Naturally they can't all be Einsteins but if there is two things little kids loooove its finding out how things work and using their imagination. If the parents would actually give a fuck instead of just letting their kids run wild and ignoring them? Then i think we could avert the march of the morons. Instead sadly it will more likely be like what i saw when I'd pick the boys up from one of their friends houses, a place without so much as a magazine in the house and parents that would just sit watching stupid shit that was the equivalent of "Oww my balls" while making sure junior had a console and a set to keep him out of their hair. Its no damned wonder we have so many dumbasses per square foot now, that is the seeds that society has sewn.