During his GDC keynote today, Mario and Zelda creator (and game design hero) Shigeru Miyamoto revealed his past concerns about the risky concept of the Wii and how the "wife-ometer" helped bring Nintendo back to relevance.
Using the Wii Remote and the Wii's photo channel in lieu of Power Point and a PC, Miyamoto started by describing an industry that he said was becoming complacent with the norm. "Sales went up, but our reputation as an industry went down," he explained. The world began to forget about Nintendo, instead buying up franchises such as Grand Theft Auto and Halo.
But those franchises were targeted towards the hardcore gamer, so Nintendo saw an opening. It's well-known that Nintendo has been aiming to expand the gaming audience, but the means that Miyamoto adopted to gauge the mass appeal of games were quite interesting, yet simple (kind of like the Wii).