Buying a game disc is so outdated these days. With numerous games available for free download these days, who buys actual discs to play games anymore. David Cole, president of DFC Intelligence points out that, "in today's market it is really difficult to get consumers to pay for anything that is not top of the line."
Nintendo has struggled the most with this movement of free-to-play games. Since the release of its new console, Wii U, there's been nothing but fewer than ever sales. A part of this has to do with the fact that there are other means of gaming now. Mobile games is currently the booming industry in gaming. With games available at no charge, without the need of a disc or console, there's obviously more users in mobile than there are using consoles. A good comparison is that to Candy Crush. The makers of the game have more than 1 billion active players a day. That's a huge segment in comparison to just the 35% game disc sales from last year.
With the release of the XBox ONE and the PS4, Nintendo had nothing to compete against and has hence lost its market share. The two biggest games who have yet to experience a decline in sales are "Call of Duty" and "Grand Theft Auto". One benefit of game discs is the cheap cost of storage. With more and more storage space available to use on the cloud, the shift is happening, but is still not the cheapest form of storage. So as time goes on, you can expect video games to be available in a digital version, but keep in mind that the use of discs in general is declining.