Free to Choose Your Own Ending

Individual choice comes to film with Turbulence. It reminds me of the Choose Your Own Adventure series. This raises some questions, though, regarding the nature of storytelling. For example, consider the fact that in a standard narrative, we are watching to learn what the characters will do, which teaches us something about other minds and other choices. However, if we are deciding what the characters will do, what is the role of narrative? Does film become something more akin to a video game? Certainly such films could be interesting from a game-theoretic perspective -- but it would tell us more about the audience than the film itself, would it not? Are there other issues one could raise?