If the money to be made from Openskies would be wiped out by the possibility that it's pilots might want a pay-rise at some point in the future, then it is hardly a viable business plan is it? BA is simply being greedy, and hoping to get away with it. Luckily, BALPA and the BA pilots are not going to let that happen.
The strike ballot closes in 5 minutes. Then watch the share price fall. The shareholders are not going to be happy with you BA managers, unless of course you have a very good argument to put before them.