^^
I agree, IMVHO Nintendo's minimum goal for Wii is to enter in the club of 100+million sellers, possibly beating at least PSOne too.
Obviously Sony will do its best to make beating PS2 as hard as possible, but Wii has good chances anyway, provided it has at least a 7 years plan. The only risk for both Sony and Nintendo is that PS2 and Wii seriously risk dwarfing successive generations for a while, just like XP is doing with successive versions of Windows.