Overall software sales for the Wii look to have peaked earlier than the Xbox 360 and PS3. http://www.vgchartz.com/yearly.php
I suspect that this year might be the peak for one or both of the HD consoles, however theres also a chance the Move and Kinect accessories might peak interest just enough to keep the software sales flat or slightly raised YOY even as overall traditional software may start showing declines, like for instance the regular sports series.
Tease.







