The long-term trend is actually for intelligence to increase...
https://en.wikipedia.org/wiki/Flynn_effect
I volunteer for some academic competitions for talented and gifted students in the Maryland and Virginia suburbs, and some of the high school students involved in the same are almost
frighteningly intelligent compared to what I remember from the same era. I have no worries there will not be future stars and leaders coming out of that.
I think there is a bifurcation in the "path" many children and young adults take in life. The playing field used to be a lot more level in my parents and grandparents' generations (and I am 31 now) when socioeconomic and familial circumstances were more even across the population compared to where they are now. That has changed significantly of late.
There are a
lot more families now of single-parents, who are obviously fighting the good fight, but the less certain home and economic situations that come with it are putting a lot of kids behind on the "social capital" pyramid. At the same time, there has been a rise of "super-couples" -- two parents in a stable marriage, both with good careers and most often both with college degrees, bringing a few children into the world and endowing them with practically every advantage from birth through starting college and even into the labor market.
We have more falling behind
and more surging ahead than we used to.
These socioeconomic changes and the "
positive assortative mating" of the super-couples is changing our society in ways we do not often appreciate. We often want to put simple economic explanations on them (i.e., immigration, globalization, capitalism, inequality, etc.), when many of them have deeper familial and demographic roots.
I actually think parenting has trended towards the "smothering" nowadays. Adolescence keeps getting extended because of the parents, not the kids.
I think of how much interaction and supervision most kids I see nowadays from their parents, particularly in those good familial circumstances, has gone up and up and up. I compare it to what I had... a father who traveled almost perpetually for work and a mother always more interested in her own social life, to be honest... and think I was basically on my own day-to-day far earlier and had way more autonomy at a younger age compared to kids now.
I think that over-parenting does leave some of them docile and overly risk-adverse, though. Sometimes you need to screw up on your own to learn.