Also, no union employees at Blizzard were impact by Microsoft's Xbox layoffs/restructuring.
Goes to show, Unions are important and work. The best time to unionize was several years ago. The next best time is now.
It might have to do with the unionisation, but I wouldn't be surprised that its just that Blizzard is like one of the like 4 money makers that MS still has in the gaming division and that is why they were spared.
Unions also many times (especially with "guild" type unions) can serve other valuable functions like guaranteeing a higher minimum quality of work (generally).
I know it's cliche, but what are the thousands of people that work there doing all day?