SwissNeutral:
As pointed out elsewhere, BA are unlikely to dismiss 7,000 cabin crew due to the impact on the operation. But if only 2,000 cabin crew strike BA may take a harder line. 2,000 cabin crew could easily be replaced by MF, volunteers and temporarily reducing crewing levels until MF numbers are up to the required level.
Surely a more effective option would be to dismiss strikers on day 1 of any industrial action? Or if action is in blocks of 3 or 4 days to dismiss those. It would send a message loud and clear.