AFAIK each generation has expanded in terms of marketshare.
Wii U will probably sell 80million at least if it is in 3rd place. 120m if it is in first.
Leatherhat on July 6th, 2012 3pm. Vita sales:"3 mil for COD 2 mil for AC. Maybe more. " thehusbo on July 6th, 2012 5pm. Vita sales:"5 mil for COD 2.2 mil for AC."