Wascrew
But under your scenario, if only 1000 people go on strike, and 9000 don't, the 9000 will stay on their current terms and conditions.
That will not sufficiently alter the cost base, and it will not remove the staff who are quite happy to vote to go on strike.
BA needs permanent change, and the introduction of a LGW cost base at LHR will achieve this. Remember, as nice as the current crew are, they cost twice as much as our competitors.