"Its not the oath that makes us believe the man, but the man the oath." - Aeschylus
Their (the union's) "word" is meaningless due to their behaviour. There is now zero confidence that this won't happen again. And as stated, even if they signed a "contract" or "document" not to strike, would it hold up in court? Would a "return to work" order be immediately enforceable, or would it get tied up in the court system?
I think what's happened here, is that the actions of the unions have shown WB that there is issue with labour laws and that this seems to be a dispute between the unions and the government; WB just wants to make a movie, not get involved in politics. If NZ is going through developmental changes, they don't want to get caught in the middle, with deadlines and millions of dollars at stake.
I listened to the whole "statement" he did say the government was contemplating trying to sweeten the deal for them, but he said they were quite clear their anxiety was based solely on the instability of the workforce. The difference between NZ's tax breaks and the other countries isn't "in the tens of millions" according to Key. So, I'm assuming from they way he said it, the savings are insignificant. But in the end, Warners DID loose money by halting production by this whole ordeal.... [unsure]