I am honestly convinced that gaming trends follow a specific generation of the population, who are now in their early-mid twenties. I think less and less does this age group have time to sink 60-80 hours worth of gameplay into one title unless they are mobile, which would explain the massive popularity with the Nintendo DS. I even know some diehard RPG fans who have had to pass on the newest Persona because they were too busy with life.
It should be noted that this theory is thrown out the window when it comes to MMO's.









