What makes you think that's limited to Canada?
It's happening here in the USA, Japan, and much of western Europe as well. It's also probably happening worldwide too, although I haven't seen figures from other countries.
Example: About two years ago I applied for a job at a McDonalds here in Texas. The manager showed me a huge stack of resumes (there had to have been at least 500 or so.) A number of them already had fast food experience, and some of them were even regional managers of fast food joints at one time or another. Underemployment has increased dramatically since September 11th, 2001 all over the world. People who graduated at the tops of their classes are finding that they have to stick with their Mcjobs because the number of supervisory jobs (that actually pay a decent wage) has plummeted.