That of course is the big question.
there are quite a few people on here who seem to think that Australia will finish up fighting China, and some seem to look forward to it. There are also those who would support the USA come what may. And those who can't face the idea that a very small set of armed forces may be a reasonable position for Australia. A constabulary force in your own (very large) backyard.
That's for Australia and Australians to decide - but I think the rest of us should point out the issues with the various choices.