With gaming no longer the bedroom pursuit of adolescent boys who should really get out more, the movie industry is starting to get a little nervous about what it’s doing to the box offices. Variety magazine has now put a figure on what is gearing up to be the biggest game launch in the history of gaming: $400 million. And the fear is that this is one $400m that won’t be going into the pockets of Hollywood execs like it’s supposed to…