To be honest and indeed fair, there is no job security anywhere. Going to university for a degree doesn't guarantee you a job after one graduates as well. Understandably, the risks of choosing this path can be higher, given the large amount of money that one has to fork out and the many factors present that can prevent you from getting that job at the end of the day.
If you go through the list, cadets who have successfully completed the course all have a job with their respective airlines; at least, without consideration of external and factors that can affect the industry, the airlines have the intention to employ.
I guess at the end of the day, you have to consider all the risks and factors and make an informed decision. Jobs are not guaranteed, but nothing in life is, and I might go as far as to say that opportunities to be a professional pilot have never been this many made available to locals today.