The result I believe is that normal childhood development of self-regulation begins to look pathological and becomes diagnosed as ADHD. At the same time we've been demanding more at younger ages, ADHD diagnosis have greatly increased [2]. Additionally, roughly two-thirds of these kids won't have ADHD by the time they become an adult [3]. I think this points to the fact that we're simply expecting too much academically too early and we're compounding this by taking away the physical play that would help them develop.
We need to reset kindergarden back to where it was so that most kids have a chance to properly develop. We also need to restore the idea that children are suppose to play, that it's good for them and not a waste of time.
P.S: For that other 30%, ADHD is real and drugs may be entirely appropriate. I'd also suspect that more play and pushing learning later will help them as well.
P.P.S: We also need to find a way for the kids that do have the self-regulation to learn more advanced material. Right now schools do a terrible job of dealing with the kids on either end of the bell curve of learning skills.
P.P.P.S: Boys appear to lag girls by almost year in terms of their self-regulation [4]. I suspect that is why boys are far more diagnosed with ADHD. In any case, I believe this is hurting both boys and girls, it's just more apparent in boys.
[0]: http://www.scholastic.com/teachers/article/what-happened-kin... [1]: http://www.reviewjournal.com/news/education/many-schools-cut... [2]: http://psychcentral.com/news/2013/11/25/adhd-diagnosis-treat... [3]: http://www.healthline.com/health-news/mental-adhd-causes-pro... [4]: http://www.theatlantic.com/education/archive/2014/09/why-gir...