Why the Wii is in short supply: Nintendo plays it a Wii bit cautious

[DonWii]

After being left with tons of Gamecubes sitting around after the first year last generation- and haulting production for months(costly)-, Nintendo is not taking too many chances, even if most signs point to success.

I don't blame them, though.
However, 1.8M units a month is nothing to sneeze at either.