No. China is a divided country today, if you believe the official view of both the P.R.C. and R.O.C. regimes about Taiwan as a territory of China, and China was divided into territories ruled by warlords as recently as my own parents' childhood. There have been many periods of Chinese history when the territory that is now known as the country of China was ruled by multiple, warring regimes, and interregional ethnic tension among nominally "Han" people in China is well known to anyone who speaks Chinese (as I do) or has studied Chinese history (as I have). I referred to Yugoslavia in my comment to which you kindly reply because this is an example that has been pointed out to me by Chinese social scientists. If one accepts a Marxist framework of economic determinism, as many social scientists in China continue to do, the break-up of Yugoslavia was all but inevitable once regional economic disparities became as great as they were in Yugoslavia in the 1990s. But regional economic disparities in China are now greater, and not least in the large swaths of territory that historically have been part of Tibet and eastern Turkestan.
The reason that the Chinese Communist Party is worried about the distribution of wealth is that they don't want a communist revolution, such as the one that originally brought them into power.
Yes, the current leaders of China have violent regime change as well as territorial dissolution to worry about. I'm agreed with you there.