And now, my real answer.
They shouldn't team up because competition between the three (and three is the magic number-there must be three for there to be balance in the console wars) drives each company to do better. If SoNintendo existed and destroyed Microsoft and the other operating systems, what would be the motivation for them to improve? They'd be the only game in town.
Would Sony have as good of a first party line-up if Microsoft didn't exist? Would Nintendo have motion controls if Sony didn't exist? Would Microsoft keep improving their online if Sony wasn't always catching up to them? Keep all three separate and successful (easier said and done in this day and age).








