An emotional issue no matter which side of the fence you're on. Still, I'm willing to bet that most of the naysayers will change their tune somewhat when they approach the ripe-old age of 55.
Let's face it, at some stage we're all going to have to deal with this issue, bite the bullet and take the good with the bad. A retirement age of 65 is fast becoming the norm in this and other industries. Some will no doubt lose out in the short term with delayed upgrades, but be better off in the long term with the possibility of working longer. Like it or not, retiring at 55 is no longer an option for many of us, given the paltry returns we're likely to see from our P-Funds and other investments over the next decade.
If the past is any guide, it would be better to negotiate something with the company than have yet another 'improved' contract imposed on us.
(PS. I'm not 55, but I hope to be one day and I'm darn sure I won't be ready to sit by the fire with my feet up...)