I would hope by 4 years you'll have moved your life along and will be in a better place. However I think if it does come to that your union needs to get involved with making sure that you'll be called back no matter how long it takes.
I would have to ask you this: considering how much you were making at ASA, would you be willing to still make that same pay 4, 5, 6 years from now? At some point we all have to get on with life.