I was in my local gaming store earlier and Wonderbook was SOLD OUT. There were a few angry Harry Potter fans there too who looked pissed off! Anyway, this got me thinking...
JK Rowlings Harry Potter movies have grossed $7.7bn worldwide. Lets say 10% of these people buy Wonderbook...
$7.7bn / 10 = $770m
$770m / $60 = ~12.8m
Wonderbook will sell 12.8m copies.
My prediction threads:
Wii U will sell under 40m units (made on 14th September 2012)
PS Vita will sell under 20m units (made on 30th September 2012)
Wii U will sell under 7m in 2013 - I was right