One thing that I've always found interesting about Japanese history (a subject I'm really unknowledgable about admittedly), is that they've had a single ruling dynasty for pretty much their entire history, even if that dynasty was powerless of much of it. Yes, they were seen as divine, but so were Chinese emperors, Egyptian pharaohs and Merovingian kings but none of their dynasties lasted for two thousand years. So my question is, is it possible for the Yamato dynasty to be dethroned? And what would happen if the Yamato dynasty was overthrown or died out? Would Japan break apart or would the Shogun take the throne? Or would the position of emperor cease to exist and the Shogun would just remain the leader? What about if the demise of the dynasty happens before the Shogunate period, does the title go to some other noble family in Japan?