2010 will be a better year for Wii than 2009 was for sure. If Nintendo has not learned from its mistakes and allows the Wii's momentum to collapse like it did in 2009 again this year I'd be totally shocked. Already we know it'll have a better start this year due to Mario having a better effect on hardware adoption than Animal Crossing and Wii Music ever could've.
So yeah, my vote it 2010 > 2009.