I am from the Atari 2600 generation in the early 80's and had loads of games. But you can't compare those games to what kids have today. In those days, the games were very simple and got boring pretty quickly. And once they got boring, we went outside to play. Today's games are far more exciting, and they are so complex that to master even one game takes the equivalent of a college semester's worth of study. Therefore, it would not surprise me at all if today's kids spend far more time with video games.
Somewhat agree this could be a factor. I don't think it has to do with games being harder to master, and more appealing today. I think any impact caused by gaming would be from the advent of online multiplayer. Multiplayer games like Call of Duty have no start and end point, you just play over and over with your friends. When I was a kid I would ride my bike to a friend's house to play video games together, now that is done from home.