The Govt. have no hope passing any laws that cap redundancy payments so long as the Senate holds its current form.
Not taking a package if you were in two minds now though is risky, if it is a package you are expecting. I think a more likely issue that will face us in a few years will be a massive labour shortage. At Qantas the average age is over 50. They will always need people to fix aircraft and in 10 years, maybe even 2-3, the cupboard will be bare.
They will be screaming for blokes just as they did in Europe, packages will be a thing of the past.