The Wii is currently following the GC Legacy. High sellthrough of hardware but crap software. Lack of support will place the Wii (longterm) in a 2nd or 3rd slot position.
PS3 is so sad right now im thinking Wii will get 2nd place with X360 being the overall winner thanks to extremely solid support from 3rd parties, a fantastic and currently unbeatable online component, and a commitment to fire on all cylinders as much as possible. Whether or not they fire on each one effectively is up for debate, but unlike both Nintendo and Sony, they arent turning a blind eye to a lot of things.