It will not, because it doesn't impact the genetic/hereditary factors in any way. Getting your body in shape does not cure actual ADHD. Exercise makes it at best manageable for the low-severity cases.

> In a darker vision, the future society will be more heavily dependent on drugs, regardless of age.

It's kind of a given, until we transition to post-drug era, where we inject our bodies with nanobots that fix what wasn't already fixed by genetic engineering of the gametes.

Until then, I think it's worth re-evaluating this view while replacing "ADHD" with "diabetes" or "hypertension" or "rheumatism" or "asthma" or... insert any persistent and disruptive condition a person may suffer from regardless of the shape in which they keep their body. We should apply drugs where they help more than they harm, until we have better alternatives.