Look, I'm all for considering the torture and gross mistreatment of some animals a crime. However, this proposition is all kinds of stupid.
Regulate hunting out of existence? Look at areas in the united states where deer hunting is illegal-- the critters are so grossly overpopulated that they graze themselves to starvation. The last ten years have seen an explosion in feral pig populations; animals with no natural predators.
Perhaps we can get an aussie to comment on the god given and human rights of a cane toad?