It is inevitable that public debt will rise in Australia under current circumstances given

that the federal government does not want to increase the overall tax take given the depth of the spending gap it is trying to fill.
that the federal government has voluntarily imposed a rule that it will match all net spending fully with market-based debt issues.
that the federal government knows that it would create hyperinflation if it didn't drain the funds.

Answer: that the federal government has voluntarily imposed a rule that it will match all net spending fully with market-based debt issues.