It may also be worth a thought that if Balpa and the BACC can't even get the wholehearted support of the majority of British pilots due to the fact that Balpa is not "BA pilots" and pilots are not all Balpa members, then the public (on an average wage of 25 000K) will find it hard to be sympathetic if industrial action was felt necessary.
Presumably if openskies were to employ pilots, then Balpa would want them to apply for membership to plump up it's coffers, or would they decline all membership applications? No conflict of interest there then.