Is a Predator Free NZ possible?

Here is an interesting audio link to Radio NZ, providing a good overview of the challenges of a Predator Free NZ.  The discussion about "the onion effect" has direct relevance to the Halo Project.  It is reassuring to hear others speak of the feasibility and relevance of projects such as ours.  What do you think?  Is it doable?

http://www.radionz.co.nz/audio/player?audio_id=2582951