I'm sure BA would happily let upto 2000 cabin crew go - it is after all what they have stated. It would certainly be a heck of a sight cheaper for them than any redundancy package.
BASSA members better be very, very, very sure that they are not volunteering for dismissal by taking part in any illegal industrial action.
BASSA do not have a good track record of being open and honest and disclosing all the details to their members - this could and probably will be used by BA lawyers to prevent strike action - again BA have a track record of this, BALPA had to disclose all relevant info, including forum posts to the court over Open Skies.
If there was ever a time for BASSA to smarten their act up it would be right now.