According to VGChartz, The Wind Waker is the 6th most sold Zelda episode, with 4,60 million units for 21 million Gamecube units sold. A ratio of a bit less than one fifth. This doesn't mean something, cause Zelda games are prdominantly bought by fans but we can hope a ratio of one tenth, may be 700.000 or 800.000 units sold by the end of the year. There are Zelda fans who are not Mario fans, but I think that they are not so much. Moreover, it's a remake. The Wind Waker HD is definitely not a system seller in my opinion.
Yoshi's the best of the beasts
Yoshi's the best of the beasts