Zekkyou on 04 February 2014
A combination of the failure of Nintendo's home console, the shrinking handheld market and the movement of the "casual" market to mobile is responsible for a lot of the apparent shrinkage. That said, the core home console market will likely see some growth (relative to the length of the generation), as well as PC gaming becoming more popular.
In simple terms the largest chunk of that market reduction is due to Nintendo's current decline.
