The "onslaught of departure" that you refer to was planned as one of the many ways BCSC is reducing the budget. A teacher at the top of the pay scale (which they have reached by the time they are eligible for retirement) earns significantly more than a teacher with less experience and/or education, thus an incentive was offered to encourage those retirements to save dollars.
In addition, 14 certified staff positions will be eliminated and those individuals moved to classroom teaching positions for next year, some at a reduced salary: 2 Technology Trainers,2 Elementary World Language Teachers, 5 Media Specialists, 5 Elementary Assistant Principals.