The Wii is nearly four years old and after a major rise in sales it's no surprise that demand for the Wii is finally cooling down. Nintendo announced this week it sold 20.53 million Wii consoles in its previous fiscal year (April 2009 - March 2010), a collapse of 21 percent compared to the fiscal year before. For the current fiscal year, the Japanese firm expects the Wii will hit shipments of 18 million units.
For the financial year running from April 2008 to March 2009, Nintendo sold 25.95 million Wiis. Over the same period last financial year (Apr 09 - Mar 10), sales were down to 20.53 million. Still a remarkable number overall, yes, but it's also a 21% drop in sales over a single year, which is surely cause for concern at Nintendo.
Ironically given the recent reveal of the Nintendo 3DS, the DS family fared a little better. Although sales were also down for Nintendo's handhelds, from 31 million to 27 million, this is "only" a 12% drop, something the company had to be expecting, given the fact the DS is five and a half years old.