If there is a problem with standards at Jetstar, in particular cadetship standards and it is deemed to be an un-acceptable standard then you change the supply/demand equation don't you. More experienced FO requirements would mean the end of cadetships & cadetship pay.
Rather than sit back complaining on this bulletin board about pay & conditions, do something about the root cause.
I'm far from naive, been around a while now. Selfish has nothing to do with it. The situation is what it is, if you have strong concerns with the industry & it's safety standards do something about it.