It means they'll know one thing. They won't have time to get into anything else. Every day, they'll have to make the decision to play the one video game/watch the one TV show they know they'll like, or take a risk on something new. They'll choose the safe bet every time. This means they'll not be the Amish kids, they'll just be the kids that are really obnoxious about Power Rangers, talk about Power Rangers all the time, wear only Power Rangers clothes, but have never seen any other shows or played any other video games.
It's a great strategy if you're trying to breed risk-averse, close-minded social outcasts.
This is entirely contrary to my experience. My kids have slightly looser controls in the summer, tighter during the school year and it just doesn't work like that. My kids watch a range of stuff, have a range of friends, and all have skinned knees from playing outside with their friends which seems not to be a trajectory of social outcasts. I will remind my daughter who currently has a shiner on her forehead from trying (and ultimately succeeding) to do a trick on her rip stick that she should be more risk averse. In my experience coaching, the kids with no media limits are either from poor families or are the real dullards of the group.
