Found this article the other day and thought it was interesting: Gaming Industry Numbers Keep Sliding.
The takeaway is that console game industry is shrinking a little bit. But the numbers do not include any online games like World of Warcraft, League of Legends, or offerings on Steam. Clearly, I think games like LOL that is free to play but offers a number of micropayment options is the future of gaming. As the article states, clearly the industry needs a new way of counting sales.