Since we're mailing in the anecdotal reports.. My sister has never been antagonistic to gaming, she loves her MarioKart, spent weeks playing the Sims etc, but there was no way she'd ever spend money on the habit. Last year she surprised me by getting herself a DS for Nintendogs (she just missed our family dog), I managed to push Animal Crossing onto her, then later this year she picked up Brain Training & Monkeyball of her own volition (it was the advertising that got her to pick up BT, I'd never spoken to her about it). Speaking to her just last week, she told me that she'd started putting money away for a Wii, because it's iPod sexy, feels similar to a DS, 'seems cheap', and because she can't wait to play MonkeyBall on that thing.
So there you go, there is no way in hell she would ever buy a ps3 or 360, not even in three years with the inevitable price drops and redesigns, but she can't wait to get her Wii. It really is appealing to people who would never otherwise consider picking up a console, whether that's enough to counter the hardcore who'll leave because of graphics/waggle.. well we'll see.