I didn't even think about the medical impacts like neck, back, eye and wrist pain much. I think we can attribute, at least in part, this epidemic to parents as well.
More parents are working now than ever. Cell phones and texting weren't even a thing 20 to 30 years ago, but we have cultivated a society of pocket-sized-techno-gadget-dependents. <- Just made that up :)
I digress. My suggestion is for parents and guardians to engage with children more. Take them out somewhere. Introduce recreation early and often. Set boundaries, then lead by example.
Not just for parents, but for any major influence in the child's life.
Very thorough and informative post as usual, @soldier.