Is there really a choice? If the Union doesn't get in then what next? Enough was stripped away during the good years, who knows what's next. I believe the management would cut their nose off and follow through on their threats but they will only hurt themselves. They need pilots long term and they need to keep the job attractive to fill the vacancies. Plus, they have a responsibility to the board and the shareholder not to wreck the shareprice with pointless aggressive anti-union activities.
But it will be horrible for a while.