Interesting approach by the airline. At least they are telling it like it is: they don't expect demand to be there.
One thing not mentioned is if you quit your job, you don't get unemployment. If I was an employee, I would wait until I was told my services were no longer needed unless I had a definite job lined up.
EDIT: Additional info: All executives and office staff are being told they must take at least 50% of their remaining vacation time and at least 20 unpaid days off by the end of September. Staffing cuts are looking to be 30% across the board once October gets here, barring any miraculous return of passenger loads.