Even Nortel filied bankcruptcy protection, I bet there will be less than 40% of Nortel employee who will lose their jobs, the reason is clear that Ericsson/Nokia/Huawei will catch up these existing business.
4000* 40% = 1600
Of these 1600 people, who willl leave ottawa will be less than 30%, the reason: some of them will get other jobs in Ottawa eventually, some of them won't move since the spouse still has job here.
The family will leave Ottawa will be less than 500, and it will span next 1~3 years, the impact will be very limited.