I think we need to pause ALL arrivals. Cases in HQ are rising and spread is happening
I hear where you are coming from but I don't think it is reasonable (or legal) to deny entry to Australian citizens into Australia. How many countries in the world are effectively stopping their citizens returning home by restricting hotel place and thus seats? It is the first job of government to look after our own.
If you can get to Australia by your own means, they have to let you in. Boat, private aircraft etc.