It all comes down to risk versus reward. Some are willing to risk a relatively low % of their yearly salary in order to seek rewards for the rest of their careers within the airline.
What it will cost the airline in comparison to the individual crew member is huge. Crew would rather not take the risk but when backed into a corner there is no further choice and a joint front must be presented.
Perhaps other parties who have bonuses linked to turnover (which may be reduced by Industrial action) wont love the idea.
Good luck everyone.