The debt has to get paid somehow in order for the government to meet its ongoing financial obligations.
When I say ongoing obligations I am referring to welfare and Medicare.
EDIT:
Australian debt to GDP:
https://tradingeconomics.com/australia/government-debt-to-gd....
For a US perspective see below:
https://uscmarshallweb.s3-us-west-2.amazonaws.com/assets/upl...
The debt has to get paid somehow in order for the government to meet its ongoing financial obligations.