I say Home console and smartphone.
With home console that can count on backward compatibility in future i'd imagine a decrease in pc market. (Sony and Microsoft are porting all the games they can on PS4 and X1). Home console will be set top box with the best games on, and a gamer will pick it up one for sure instead of a normal cheap set top box.
PC market is decreasing, apart gaming, and i can see it touching it's peak in 2 years regarding gaming, but then, with console that allow bc alongside new releases as well, i'd imagine a decrease.
Smartphone it's obviously the leader in handheld game and i can't see how a new handheld console could surpass it.
VR it's a crack, could be bigger, but how bigger? I don't think that will be so popular in the next 10 years.