so basically Ming is unsalvageable? even when they end up as mere hereditary symbolic head of states?
Only if the Ming intellectual and scholarly elite manage to cajole and subdue the nobility into forming a German/British model of government to keep up with the rest of the world (or almost exactly what happened in Japan).
The Ming's not unsalvageable though, and the Ming government was seen as rather innovative for the time in that it had a bureaucracy that as a whole managed to provide a more open check to the Emperor's authority. Strong Emperors got around this, particularly toward the beginning, but as the Ming declined the Bureaucracy was able to effectively limit the power of the Emperor. In OTL this hastened their decline and the Qing made sure to kill that new institution deader than dead with an extra helping of dead.
Global Climate Change caused massive famines, political instability was common, and the Qing proved to be an existential threat to the dynasty, but with more competent leadership, Bureaucratic politics kept in check by capable Emperors or by even more capable members of the scholar-gentry, and the ability to prevent the Jianzhou Manchurians from getting in a position to effectively take on China, or defeating them early on and not having the main frontier general give away the keys to the kingdom because of frankly byzantine politics ruling in the capital. Maybe, when things are getting bad, a Zhu prince somewhere in the provinces who is an experienced general marches on the capital and installs himself as chief minister of the state and perhaps usurps the throne - which has a 50/50 chance of restoring or ruining the dynasty depending on the man, his kids, and how bad things are around him.
Depending on butterflies, you might actually get a non-western state developing something akin to constitutionalism independently of the West.
Another interesting note, the Qing's administration can be seen as a conservative reaction to recent innovation. In some ways later emperors tried to be more Chinese than the Chinese when it came to administration and airs of empire, and with the resurgence of conservativism most of China's relatively vast technological and astronomical know-how degraded and decayed to the point where Europeans had to teach Qing officials topics and studies that any Song or early Ming official would have needed no instruction in.