Even if it does happen, employment will most likely be on a specific Australian base contract through an entity set up specifically for hiring crew in Australia. You cannot maintain a non-resident tax status and be an Australian-based crew.
Anyway, I'll believe it when I see it. Hopefully, it does happen and shakes up the great Australian employers to pay a wage commensurate with experience and skill. However, the C-suite in Australia is a toxic gas and would rather shut down the industry than improve T & C's, but I digress.