Small problem with your union vote. It violates the Canadian Charter of Rights.
Aside from that it is interesting that the majority of AC pilots voted against it. Something like 90% of WestJet pilots were for it. I wonder why?
As for what one signs on for , I presume you will be happy with your pay and terms of employment when you were hired to remain the same until you retire.
We took the view at WestJet that not many guys would want to fly past 60 but we felt that those that did should be allowed to. Sure it slows the upgrades a little but who knows , by the time you turn 60 maybe you will want to or heaven forbid , have to fly past 60. It's nice to have the choice rather than to have a decision like that made for you.