That PA is perhaps the 'weakest' from of industrial action I have every heard of. What is the next plan, I am not overly familiar with Australian Employment Law, does further action require another ballot??
Passengers are just going to either ignore such a PA or complain about being disturbed by it. I can almost guarantee that the majority of the population don't give a sh*t about Qantas Pilot for Qantas Aircraft, they just want the cheapest fare. The same as we all want the cheapest goods when we shop around. The best way to spark a good public interest in whats going on is to park up a few aircraft.