Mao can't run amok like he did OTL. There are solid institutions now in China as well as patriotic and "democratic" spirit, so he is the president but it is not his regime. He can't launch mass purges in peacetime without serious justification, and his most insane economical policies just won't fly.
True but he can play is political games. Probably Chinese purges would look like getting kicked out of the kMT and forced into retirement. Mao will probably use the Chiang Kids who are too close to the Pro Colonial Germans as a reason. Now its interesting on how Mao will deal with teh famine. again as said earlier not surprised a deal with the USA nukes for food and trade.
Heck it might even be funny, if they send Richard Nixon as US envoy and or ambassador to Mao in the 50s. So USA-China close relations detente happens in the 50s instead of the early 70s like in OTL.