Indonesia and Malaysia will be a problem, but without a heavyweight power industrially helping they are destined to lose in the long term. Especially in a world where killing the population that is revolting in whole or in part is a relatively common practice. China does not have the industrial power of OTL, firstly because it does not have a Soviet Union and secondly because they are still led by Mao. The Chinese economic boom occurred in the 90s. With the boom being created by strong American and European investments. That doesn't exist in this world. Japan, which lived in a more friendly world, took 40 years to go from a third world society to a first world one. China, with its geographic and population size, will take much longer. About 60 to 80 years old. Which coincides with the rise of otl china, but this was accelerated by the USA so I would say that for china to have a power similar to otl it would take about 100 years. Especially since they will have to do everything themselves. But assuming the situation is bad, Australia will still be calmer than the vast majority of countries in America, Africa and Eurasia.