Dispatches: While its doubtful all games will go to Games-as-a-Service any time soon, I wouldnt be surprised if gaming goes 100% digital in the upcoming generation of consoles. By then more people will adopt the subscription option, and as this younger generation of gamers (the iPad generation) comes along, they arent going to want anything but a subscription service.
Source: N4G PC What Is the Future of Digital Gaming?