Avinash,
You've been around long enough to know that you can't compare Wii first year to PS2 first year properly since the PS2 launched in Japan first:
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=All&cons2=PS2®2=All&cons3=PS2®3=Japan&weeks=156
By the slopes of the graphs you can tell that the Wii is selling at approximately the same rate as the PS2 in its first year once the rest of the world kicked in. True, the Wii was supply constrained whereas the PS2 wasn't. But you can't say the Wii will double because the PS2 doubled, because the PS2 DIDN'T! Look at the slopes, they are the same.
This is an interesting graph showing how the Wii is currently doing in Japan:
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=All&cons2=PS2®2=All&cons3=Wii®3=Japan&weeks=156
Prediction:
The PS2 & PS3 will outsell the Wii in 2008.
Lifetime sales of PS3 in Japan will be at least 8 million consoles.







