Well, that's to be expected. I don't think anyone out there with any knowledge of the industry expects next-gen consoles to come close to the install base of the Wii/360/PS3 generation. It'll probably be larger than the GCN/Xbox/PS2 gen, most likely in between that and the current gen.
I mean we're talking an install base this gen of 242 million vs last gen's 166 million. Apples and oranges.