"The reality is you will NEVER get 100 percent of the population vaccinated"
And of course you don't need to - most sources reckon that over 60% fully vaccinated is probably enough - especially if that includes all the at risk groups. 25% or so of the population is under 20 and has extremely low death rates
If the UK can vaccinate 59% with one shot and 37% with two shots in a few months there really should be no reason why Australia can't be open by October