Simple solution to the problem:
At 1700L today, Willie should issue a 24 hr final warning to all cabin crew. Reject the strike, turn up to work as per the roster and crack on with a merry ho ho ho for the pax.
At 1701 tomorrow, all those not converted back to the right way of thinking will be sacked on the spot - its the least they deserve. And if you ask very nicely, you may be rehired - with a revised contract of course.........
When the survival of the company is at stake....