Odds of Hanging On
If your editing is choppy, or if the dialogue doesn't line up, or if the music you insert into scenes doesn't exactly fit ("Freak on a Leash" may not have been the best choice for that tender love scene), you might be in trouble.
The motion picture business isn't going anywhere, so if you can get in and prove yourself worthy, you should have a long and fruitful career as a sound editor (cue sound effect of cash register opening).