If the Moakists are still in charge, I very much doubt the union would take it all the way through the grievance process and force compliance. If recent history is any guide, they'll go through the initial stages of grieving it and then settle with the company in exchange for something else - perhaps lowering the 50 seat cap by another 20 airframes? - and a promise to never, ever do that again. Oh, and then loosen the ratio in the very next contract.