Yes, the Wii will pass the PSP in Japan.
Align their launches and see for yourself:
http://vgchartz.com/hwlaunch.php?cons1=Wii®1=Japan&cons2=PSP®2=Japan&cons3=PSP®3=Japan&weeks=225
If the PSP were to win, then the PSP would have to sell this well forever, and the Wii would have to have this drought forever. Both are possible, but I highly doubt that's what will happen.












