Docspock, the idea of teaching art is to help the pupil develop as an artist, to encourage them to try new ideas, to critique their and others' work constructively, to learn about techniques and to generally develop the confidence to actually get out there and create. I had a very good art teacher at school, and have a friend who was also a good art teacher. I am still useless as painting and the more 'traditional' forms of art, but at least I can recognise what's good and bad in a work of art, and appreciate it even if I don't like it. Actually, what I learnt, I've managed to apply to (and compare with) photography, which I am halfway good at - many of the principles are the same.
miss_Art, have you thought about adult or community education? This can happen in all sorts of places - colleges, community centres, youth clubs, residential homes, hospitals, even prisons. You get people who actually want to learn art and are committed to the classes. It may be part-time to start with, but if you strike the right note with your groups/employers, there's always the possibility of more for a good teacher.