I see a lot of people looking at the effect without paying much attention to the cause. There's still only one publisher who's heavily invested in the Wii, with Sega and a lot of smaller Japanese publishers just now coming on board.
The sales are concentrated because the investment is concentrated. Nobody comes close to spending as much on Wii development as Nintendo. Are they going to compete, or are they just going to let Nintendo have all the cash?

"The worst part about these reviews is they are [subjective]--and their scores often depend on how drunk you got the media at a Street Fighter event." — Mona Hamilton, Capcom Senior VP of Marketing
*Image indefinitely borrowed from BrainBoxLtd without his consent.







