Crazy, what I am doing is trying to predict the following years. What I am trying to explain to you, is that you are comparing the whole world to Japan. It is selling as fast as the Ps2 did in Japan. So it is going to make 21M if it tracks that line. Hooray!
Ps1 line is for only Japan, so I changed it lightly. http://vgchartz.com/hwlaunch.php?cons1=PS2®1=Japan&cons2=PS2®2=All&cons3=PS3®3=All&weeks=70
As you see, it is tracking above Ps2 Japan, but it has had 2 holiday seasons compared to 1. Therefore, it should be tracking in the middle of Ps2 Japan and Ps2 Worldwide in the near future.
This graph:
http://vgchartz.com/hwlaunch.php?cons1=PS2®1=Japan&cons2=PS2®2=All&cons3=PS3®3=All&weeks=48&weekly=1
Shows what happens before Ps2 starts to get effect of second holiday season. It's tracking slightly lower than right in between Japan and WW
http://www.vgchartz.com/games/userreviewdisp.php?id=261
That is VGChartz LONGEST review. And it's NOT Cute Kitten DS
