The question is, what are the Jetstar Pilot Group' doing about it? The most common complaint on PPRuNe over the years is that people will take reduced conditions. The inference being, if not stated outright, that those on the outside should take the hit in order to sustain conditions on the inside. Remember the conditions only have to be better than what an applicant is in now, not what it's like compared to those already employed on conditions no longer available to applicants.
If those in Jetstar don't want their conditions eroded or for that matter the pilots in any airline it is up to the pilots working there to protect the conditions.