NZ should get to choose the location of the final given that they have 12 points to Australia's 9. It would be an injustice if they lose this one game and lose the series IMO... but we all know that WC cricket is fickle.
I wonder what kind of odds you'd have got at the start of the tournament on NZ being the champions. Pretty long I'd imagine. Would really like them to win. It would make for a far better story than the 'ho hum, been there done that' one an Aussie victory would lead to. At least then there'd be ONE Saffer with his hands on the trophy!