Game Theory only helps us if it's impossible to deceive others. If one is able to engage in deception, the dominant strategy becomes to pretend to support CEV FAI while actually working on your own personal God in a jar. AI development in particular seems an especially susceptible domain for deception. The creation of a working AI is a one time event, it's not like most stable games in nature which allow one to detect defections of hundreds of iterations. The creation of a working AI (FAI or uFAI) is so complicated that it's impossible for others to check if any given researcher is defecting or not.

Our best hope then is for the AI project to be so big it cannot be controlled by a single entity and definitely not by a single person. If it only takes guy in a basement getting lucky to make an AI go FOOM, we're doomed. If it takes ten thousand researchers collaborating in the biggest group coding project ever, we're probably safe. This is why doing work on CEV is so important. So we can have that piece of the puzzle already built when the rest of AI research catches up and is ready to go FOOM.