42-43m based upon installed base at the end of Jun before production was increased to 2.4m.
At 85 weeks = 29.17m by VGC
2.4m x 6months = 14.4m max production through the end of 2008
Total would be 43.57m
That's assuming 100% sell through for the back end of 2008.
Nintendo projects to ship 51m units by the end of Mar 2009.
2.4m x 3 months = 7.2m
Add Q1 2009 production to 43.57m and...
Big surprise: about 51m by the end of Mar 2009.
Can't sell 50m units when there won't be that many Wiis in existence by the end of 2008.