AIPA can't call an all-out strike as such, because it was not an option on the ballot. PIA is constrained to what was voted on. As much as people bag AIPA and warn about strikes, they are seriously not that stupid, having closely observed what happened in '89.
As Steve Purvinas has very appropriately said (if I recall his comments at a meeting correctly): the point of PIA is to make Alan Joyce's life hell and his position untenable until he decides he'll negotiate in good faith. Not to tick off the entire nation.
Everyone should also bear in mind that Qantas, through their magnificent (sarcasm) spokespeople, are going to exaggerate the pilot claims severely. Take what they say with a grain of salt. Or if you don't want to do that, divide it by 10 and you'll get a better approximation of what the claims really are. Also bear in mind that AIPA have said outright that everything is negotiable, except the inclusion of a scope clause in the EBA (and there are precedents for scope clauses too). They are not demanding that Qantas never retrench another pilot. They are asking for what is basically the equivalent of "labelling laws" in the EBA, ie, the ingredients on the label are what you find in the tin.