I think Joyce said it best when he reckoned that it will be a shame if people in NSW can fly to the USA and the UK but can't fly to WA. I can see that exact scenario playing out. NSW will be open to most of the rest of the world (that will have us) whilst WA (and perhaps QLD and others) are still closed to NSW arrivals.
Ce la vie. We all make our choices. The people of WA and QLD have made theirs. It will take a number of focus groups to change their Premier's minds.