Problem with the OP is that it's not clear, does it speak about the new IP from this gen. Or just games that will be remember in 20 years (all gen from 1st to 7th).
I say new IP because MGS, FF, GT, Halo, CoD... are not from this gen. But these IP are likely to be remembered.
So for this gen i think:
-Wii sport even if it haven't been bundle it would have been phenomenal, check and the Jap sales where the game is not bundle and also the sells of it's sequel Wii Sport Resort (more than 15m before be bundle in certain regions too). The game define the entire generation as the "motion control generation"
-Wii fit: it push the wii to more higher height and start a new genre on his own that was copy lot of time, even on other console motion control but no one of the clone has been as successful.
-Uncharted: because the number 2 was the game that defined the PS3 and show what the console of Sony is capable.
-Gears of War: Define the Xbox360 as pushing the co-op and cover mode this gen.
Personally i like also No more Heroes to be remenber because i like Travis Touchdown and the craziness of the game (even if the first is better than the second) but honestly in twenty years, i think only few nerds will remember about it
But we must first concentrate ourselves on the way to entertain people, for video games to live. Else, it's a world where sales representative will win, which has as effect to kill creativity. I want to say to the creators all around the world:"Courage, Dare!". Shigeru Miyamoto.
