I think the travelling public are waking up to the downsides of booking with someone like Qantas NZ or Pac Blue and now Jetstar. They don't have the capacity or the network.
Nearly everyone knows of issues that they or friends have had when a flight gets delayed or cancelled due weather or aircraft unserviceabilities and then being able to be re booked at a reasonable time. Stories of days lost at work etc are not uncommon.
The other issue of missing your connecting flight with another airline because they made you late. Not their problem you have another flight to catch.
Then you have Pac Blue who won't even refund your money if they cancel the flight on you.
A lot of people are getting gun shy of these carriers, I'm sure Jetstar will suffer as a result.