Not really. If you get a seniority number at a major, you can reliably predict where you'll end up.

CFI can be ponzi-esque, but in the dark days after 9/11 I still found plenty of work with non-career oriented students. You might have to hustle, as opposed to hanging around the lounge at the puppy mill picking your nose and hoping they put you on the schedule.

This industry is best approached with lots of hustle... once you finish probation at your career destination airline, then you can relax and enjoy.