There might be another solution to kids playing video games all the time: don't buy them computers that can play the games.

When I was 14, I ended up being in a situation like that. I could play the basic games, but nothing that was really intensive. However, my computer was fast enough to code, so I ended up coding small 3d apps instead of playing video games. Those circumstances got me interested in game development, and that the extra experience helped me out in college.