This is a very demanding a competitive field to get in to. No game company really needs an "idea" guy. That sort of gets split between the writers and the designers. Your friend sounds like a writer, and at the moment there is no real clear path to becoming a writer for a video game. You have to be an established writer in other mediums (books, shows, plays, etc) and basically get lucky. A much easier entrance point is as a designer. You can get a degree to become a video game designer, but it is much more mechanics and experience focused and doesn't deal a ton with story lines or plots. I'm sure some designers become writers, but like I said, it's really hard to get your foot in the door from the writing angle.