The Morrison government says the entire population could be vaccinated for COVID-19 by the end of next year and international travel revived, as the states eased restrictions on crowd numbers and reopened their borders, fuelling optimism of a faster 2021 economic recovery.

Prime Minister Scott Morrison said there was no reason for premiers to shut down their economies again, after a review into the states' contact tracing systems found they were robust enough to stay on top of virus outbreaks and avoid a repeat of Victoria's failures.