Let me see,
Qantas = RNP AR cleared to .10 for the B737 NG, possibly for the B767 and .1 for the B787
Jet star = RNP AR cleared to .30 but shortly to .10 if not already on the A320. B787 will be .10
Air NZ = RNP AR .10 for the A320, .11 for the B737 CL, B777 on the way from .30 down to .10, B787 .10 out of the box.
Virgin = not RNP AR yet but will have initial flights underway by the end of the year on the B737 NG, not sure of the capability of the E190.
Those four carriers are responsible for what 95% of all GC jet operations? I doubt that they will be willing to pay for an installation they they don't need. When the airport company come cap in hand to those airline for the cash to pay for the new ILS I would be willing to bet they will tell them to find the money from someone else!