The next bridge to cross is that even if NSW is deemed successful, will the unaffected states decide to do the same. Personally I think not. Life in those states is pretty much back to normal and people are willing to wait for either a quick test to better manage border closures or a vaccine. Without doubt, Travel and Tourism is deeply impacted, but in terms of state by state, it's still a small percentage and a small number of individuals impacted against the population of the state. Is this something the population is willing to sacrifice in the short term ( say 2 years) I would think "yes".
P.S, You are pitching your arguments towards the Medical Industry, who are deeply impacted and lost a good number of their own.