In the next 3-4 years new games re-designed after old games (like Diablo 3) will most likely take 90% of gamers attention. The question is...what features do you like to have in future games and what game do you think is going to be successfull in the next 5 years? Personally i think MMORPG's will rule. What i like of games are freedom and real-like graphics.
Re: Speculation about the most succesfull game on the market in five years.... Elderscrolls 7... yup, that and Halo 4: The Flood Aren't Really Dead