All I see this really doing is increasing the Brain Drain. This assumes NZ has a Brain Drain and I am open to being corrected. But I am pretty sure it does have one based upon some of the comments here.
Brain drain is insanely bad. Australia has better opportunities. New Zealand government hates the educated, and replaces them with lower paid immigrants. Oh, and they replace jobs that un-educated kiwis could do, with immigrants.
