Every Non Native Species in Australia suddenly disappears. How does Australia change?

Lets say all the wild and feral species of anything introduced by humans since the Dutch discovery in 1606 vanish. How will things change with all of the nonnative species gone? Yeah I know native species will recover but how long is the question.

Humans do not disappear.

The species aren't just dead, they completely vanish.

This does not include crops or animals in captivity or domesticated.