You're underselling the exclusives on PS3 and X360. For all of the Zelda, Mario, and other first party Nintendo games, you have a bunch of Uncharted, God of War, Killzone, Gran Turismo, Halo, Gears of War, Forza, Viva Pinata, etc. between PS3 and X360. See http://en.wikipedia.org/wiki/List_of_video_games_exclusives_... - there are a lot of exclusives between the two.
I would just say Nintendo was left out of all of the cross-platform games, which is a shame. Much of the Wii's "unique" ecosystem is garbage.
We may be going through a new "shakeout" period, similar to the 3DO and Jaguar days. As for mainstream adoption, I don't see any of the newcomers (OUYA, Project Shield, Piston) taking off, but it'll be fun to see what happens.