china has a rapidly aging populace, an unsustainable birthrate, and far too many peasants to support - they’ve got a very small window of time to prepare for the collapse of the country. when it happens, they’ll retreat, eastwards, to where the larger cities are (which isnt in the western 4/5ths of the current borders). that region you’ve highlighted will be abandoned - it doesnt really matter if it’s 22c or 52c. presumably the russians or the indians will pick it up, but probably wont settle in that area.
superpower though? lol no. regional power in southeast asia, at best. manufacturing is leaving china as we speak. in 10 years most of our “made in china” stickers will be “made in nigeria”, or “made in argentina”