Alliance could fly F50/F70/F100's around NZL in NZ colours, just like they do for VA/QF in OZ sometimes. Must be plenty of routes in NZL that can't justify a B733(are there any left?)/A320.
Highly unlike when NZ has just invested in around $1billion on new A320s and 72-600 to simply the domestic fleet. They have also recently ordered more 72-600s to replace the remaining 72-500s and expand the fleet.
They have already pointed out that there 72-600s are cheaper to run that JQ Q300. Long run you'll probably see the NZ Q300s being ditched for more 72-600. With the half year profit up by 110% this year already, I'd say we can expect another order soon.