In the next 100yrs the north polar ice will melt enough that China can go around the top to it's trading partners. The strait of Malacca next to Malaysia will stop being as critically important as it is now to China's oil imports.
It's likely the SEA region will cool off, the action will move up north and all those subs we bought will go from AUKUS to AWKWARD.
Aus just needs to cut costs and forward into quality (koalaity?) manufacturing and science. Or we could just keep ripping up the ground like a bulldozer on a bender and hope China doesn't tank the iron ore price.