The new tier would need to offer some serious benefits to make it worth achieving. If someone is the type of customer earning 3000+ SPs a year then it's highly likely that loyalty and pricing is a secondary consideration if they have the option to fly with whoever offers a quality product - at least for international travel anyway, although extremely difficult to achieve this from a majority domestic flying where competition is non-existent. Why chase AirNZ elite plus (or whatever it will be called) when NZ's offering, even with new the cabins, is just so inferior to the international competition.