Personally, I think reducing the population by 30% will solve nothing in the medium to long term.

Wombats, unlike people, don't stay in their single brick shangri-las... 

They move around...

If they see an empty territory they'll move into it...

So, killing however many wombats, in a fixed area, in the short term, won't solve the wombat problem, in the longer term.

Haven't they had fires down that way that wiped out entire populations of native species?

Do they think that the wasteland will remain empty, for eternity?

Life will return to the land, and cycle of life will continue...

🙂