Is Predator Free 2050 fantasy?

In 2016 then Prime Minister John Key stood on stage and announced, "by 2050 every single part of New Zealand will be completely free of rats, stoats and possums" To many this was a remarkable statement of intent, but to conservationist Greg Billingham it was just another empty promise from an unaccountable politician. In the years since his view hasn't changed... But he does have an alternative idea - something that's already happening on a small scale.