Let alone mixing with other guests, ventilation, etc etc. I can't see this as a model that hotels would be interested in especially as Aussie tourism is picking up now. Hotel prices for business trips were low a month ago but they are rising rapidly now.
Ventilation is not an issue if there's almost no chance of someone having the virus in the first place! I get back to the fact that in some states i was OK for people too self isolate at home or in hotels of their choice if they had been a contact of someone who tested positive. But test negative and come from a a low risk country overseas, you are still considered the devil incarnate!