I cannot project the future end of any current authoritarian state with any degree of certainty. I can say that the present Chinese state derives its legitimacy from the prosperity it produces in its cities, which is probably why they've taken such aggressive steps to ensure that prosperity continues.
They may be sowing the seeds of stagflation that brings the regime down, or they may not. I can tell you what the possible endgames are. I can't tell you when, or how, one of them might obtain. They come out of crises, which are by their nature unpredictable beasts.
I can say that, in the past, many authoritarian states have ended in the manner I describe. I cannot say whether or not China has cracked the code, and if they have I will never know because in the long run we are all dead.