its becauase we already have a set good number of nintendo IPs, atleast 10, where other consoles dont. for instance, the 360, the only new IPs that i see people really caring about to the next console are halo and gears of war.
for sony, theres like god of war, and ya.
nintendo isnt creating new IPs also because right now they're busy getting another audience in. IMO, its working great, and they're doing exactly what they should for now. new IPs could come later, since we're getting tons of 3rd party support now







