Prediction - PS3-PS4 and X360-XOne last big performance spec leap

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I think people tend to forget that power alone isn't the only limiting factor in a game's graphics. Money and manpower can be bottlenecks as well; imagine building a whole game like GTA with every asset up to the standard of movie CGI, the amount of manhours and resources it would take is simply insane. It would probably take a team of thousands working for a decade at a cost of billions.