No, but it does mean that they are significantly more prone to irrational decisions. And Xi's not exactly ultra-rational to start with.
The PRC has actually managed to successfully stave off a few leadership crisis’s already, but one of the ways they did so was by moving away from a dictatorship of one and establishing term limits and a model that encourages leadership to think about the next generation and ready a successor. Xi Jinping just re-established a dictatorship of one with an unlimited term length and will presumably serve as the PRC’s strongman dictator for the rest of his natural life creating new opportunities for a succession crisis or for himself to just fall prone to old age. He wasn’t shy about killing off anyone that could have challenged him during his initial election to Premier and associated offices, we have no reason to think he’ll be any different than any other tinpot dictator in history and kill off anyone that looks like they might be gathering too much influence under his rule or looking just a little too eager to be his successor.