Personally, I don't think mainstream games are evolving enough. Innovations in games are few and far between, and few things can hold surprise and a sense of wonder like they did before when everything was knew Also, speaking for myself, all the general hailing of every new, high profile game as the second coming of Christ is leaving me more and more jaded with the industry.
As an example, despite how much I enjoyed MotB, I don't feel there really is much of a change in terms of gameplay between it and, say BG1. and that's ten years of RPG development.
Also, even where there is some sort of change in design philosophy, it isn't change in a direction I'd like tosee. It's all about wider appeal, focus groups, and profiting. For example, the way party NPC development has been handled in Bioware games starting with NWN1 seems to me like the worst possible way to integrate the characters into the narrative. It made everything about the characters mechanical and pointless, and reduced empathy to a minimum. And this from a company that professes to make games that are centrally about narrative.