No I dont think so, the game cube is doing second (really it is I have seen statistics).
No one in Japan, or UK is buying the X-Box so that is why the GC is doubling sales.

The statistics show
PS2-Everyone buys
Gamecube-Everyone buys
X-Box- North America buys

The more consoles the less cost, so actually it is kinda a good thing that Nintendo didnt merge with Sony.