Whether or not OS is postponed is up to BA. However it would not stop a strike from going ahead. The strike is about Schedule K (Scope), not specifically Open Skies.
Before this thread kicked off I was always under the impression that the dispute was purely about Openskies. I am sure many other people believe that as well.
So if BA postponed Openskies and then BALPA still went ahead with the strike anyway over schd K wouldn't this give BA the upper hand as they could say they are not threatening T & C's by postponing Openskies but BALPA are striking anyway? A
PR coup for BA there?!?!?