On "trajectory", books like "The Pleasure Trap" and "Supernormal Stimuli" discuss the theme of our scarcity-shaped inclinations being out-of-date for our world of abundance. http://web.archive.org/web/20160418155513/http://www.drfuhrm... https://en.wikipedia.org/wiki/Supernormal_Stimuli
The Pleasure Trap in particular was the first book I read that for me connected health issues to scarcity/abundance themes.
Or also "Wired Child: Reclaiming Childhood in a Digital Age" and "The War Play Dilemma" specifically on media and kids.
And also Paul Graham on "The Acceleration of Addictiveness": http://www.paulgraham.com/addiction.html
Or on insights from "Rat Park" about how social isolation and excess stress are the cause of most addictive behavior: https://www.huffingtonpost.com/johann-hari/the-real-cause-of...
What to do about that is a big challenge though... There are some ideas in those various resources.