Disposable cameras can have two advantages for learners:
- They allow to be concentrated solely on composition. So the course should be a course on composition (I suppose no artificial lighting);

- They force to think twice before taking the pictures. Digital cameras would just yield a great number of pictures. Film cameras force the learner to analyse the scene more carefully and to give up a picture if it doesn't look good enough, and I think this is very important especially for the beginner.