A tug of war over the future of media may be brewing between so-called user-generated content — including amateurs who produce blogs, video and audio for public consumption — and professional journalists, movie makers and record labels, along with the deep-pocketed companies that back them. The likely outcome: a hybrid approach built around entirely new business models, say experts at Wharton. According to a recent Newsweek article titled, “Revenge of the Experts,” and books such as Andrew Keen’s The Cult of the Amateur: How Today’s Internet Is Killing Our Culture, the pendulum between user-generated content and the professional variety has swung too far in favor of amateurs. In response, professional fare is gaining renewed favor.…