Wii has 51 millions LTD for now, which is already a great number. NSMB, Wii Sport Resort, Wii Fit Plus, Monster Hunter 3, DQ X are games which will give big boosts to the Wii sales.
And If, one day (I don't know if it will come), they make a price drop, its sales will go up.
I don't see where's the problem. It's a sure thing the Wii LTD will surpass one day the 100 millions.