I don’t buy that. What’s costing the Wii market is complete and utter saturation, plus building a quality console that doesn’t fail reliably, forcing you to buy replacements every so often to keep the investment in a game library and accessories usable.
I know a lot of people that bought Wiis, but nobody uses them anymore. When was the last time you heard of a hot new game coming out on the Wii? Lots of big games coming out on PS3 and XBox360 all the time. The market says the Wii were a novelty, like a pet rock.