Sony announced today they were past 70 million units sold as of November 4. Microsoft previously announced the same sales as of September 30. With PS3 and 360 sales still going strong, it's possible that both systems could eventually overtake the Wii. It's highly unlikely, but still a possibility.
http://www.ign.com/articles/2012/11/...lion-worldwide
http://www.ign.com/articles/2012/10/...have-been-sold