I'd like to agre with MikeB's point about attracting new gamers, a point overlooked on this board. It's the cornerstone of why Nintendo's current sales figures are so mighty. They're not actually competing for market share per se, that's an expensive strategy in a mature and saturated market: Nintendo are the first in recent years to really go for market growth via innovation and new marketing strategies... duh.
I see it as basically impossible to make "brand-loyalty" statements based on sales figures alone, even if you analyse them every which way. Cos of the amount of variables. What you end up with is significant data, sure, but not about brand-loyalty exactly.
I'm certain that a comparative stat of "What percentage of Wii/PS3/360 owners own no other consoles" would illustrate this point.
