Well, in reality 6 games are going to become million sellers in 1 week or 2 max, so 47 is closer to 50 than it is to 40. will be at 47 in April for sure. Then in may at 49 / 50.
Which games will that be?
As for the X360/Wii comparison:
The wii released on november 19, 2006.
The X360 released on november 22, 2005.
The wii reached 41 million sellers in 121 weeks. Or 48 in 123 if trestres is to be believed.
The X360 has 63 million sellers in 173 weeks.
Simple dividing shows that the wii needs almost 3 weeks (2.9) to have another million seller in it's life. The X360 needs a little less at 2.7 weeks. Now if we take trestres' word for it, and the wii will do 48 million sellers in 123 weeks the average lowers to roughly 2.5 weeks.
In other words, the consoles are roughly on par when it comes to million sellers