Wii sales are still going strong.
• January - 679,200 Wii sales in 2009http://blog.mlive.com/manzero/2009/02/wii_sets_january_sales_record.html
I agree that people still want entertainment in this economy. I suppose a "staycation" with a console at home is a cheap alternative to a vacation. I have to wonder though if the Wii might also be the introduction console that gets people interested in gaming, leading to either a 360 or a PS3.