"Eternal Darkness" didn't do it for the Gamecube. Even paying for "Resident Evil" exclusivity for several years didn't do the trick. I think part of it has to do with gamers remembering the Nintendo of their youth, only to find the style of games they enjoyed then (Mario, etc.) "too kiddy" for their early teenage selves.
The funny thing is that I've seen this in myself and others, starting somewhere between 9 and 18 and ending anywhere between 12 and 29 (it's different for everyone).
Almost universally, though, by the time we hit 30 we stop worrying about whether or not our entertainment is for "grown-ups".
There's no better mark of lingering childhood than needing to put off the image of "adult". One would have to be a pretty serious dude bro man-child to still be worried about how "kiddy" his entertainment by the time he/she hits 35.
EDIT: Forgot to mention the fact that they've gone after both "Bayonetta 2" and "Devil's Third" this gen. Hopefully a third M-rated exclusive will hit before Nintendo starts shoveling the dirt on the Wii U. I have to admit that I do like a little more diversity in intended age group than Nintendo usually brings to the table... Then again, the same can be said of Sony/Microsoft.
Retro Tech Select - My Youtube channel. Covers throwback consumer electronics with a focus on "vid'ya games."
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