Sounds Air have another Caravan coming out from the states so they will soon have 2 spare aircraft free to start new flights. Can see them easily doing both Taupo and Westport from their WLG hub.
Sunair could re-start the AKL to HLZ and KAT routes as its in the neighborhood. So when one airline pulls a route another operator fills the void.
For example WLG to WAG now is twice a day return with Sounds Air.