I think Wii will do better this year.
There weren`t a lot of great/selling games in 2009 - at least in my opinion.
2010 seems to have really good, strong titles: Galaxy 2, Red Steel 2, Endless Ocean 2, Metroid: Other M, Zelda Wii, Epic Mickey, Sin and Punishment 2, Fragile, etc.
If these games and others, are well spread out across the year, and with the momentum given by NSMBWii, i think the can sell very well!