I'm saying that if the CCP loses power there will be a break up, as the different regions won't acknowledge the legitimacy of one anther. If you are asking why they won't just bomb and attack one another, I don't have an answer for you, they very well might. However, I find it difficult to believe that any faction in China would be capable of occupying and controlling other regions, if those regions chose to be rebellious.
Something else to consider, is that the dissolution of the CCP would be the single greatest humanitarian crisis in living memory. Billions of people would be suffering from starvation and thirst. China is already a net importer of food, a lot of their infrastructure is poorly built enough that it requires constant maintenance (tofu dreg projects).