BALPA is all we have. Ther is no other union that would work for us.
AS others have said WE are BALPA; if your reps have not succeeded to your satisfaction then become a rep and fight yourself. The most sensible statement here to date is NSF's,
Do not just leave the field of battle until the rest of the warriors win the fight - no one is impressed by that.
You'd be called some choice names if you did that in the Army...
Equally, do not stand on the sidelines watching the battle and hope to win a porton of the returns for no expended effort. That is called sponging.
The ONLY way we can have a hope of making progress is by EVERYONE being a member, so we have the solidarity to move ahead. Failing to join or leaving in a fit of pique is just letting your oppos down. Simple as that.