I think its a good idea. My senior year i had an awesome young art teacher. She was in her mid twenties and really loved art. She was real enthusiastic about every project no matter how small. Plus she was real cool, treated us as equals and liked to joke around. Hell, she even let us watch the ring in class.

On the negative, you'll be a high school teacher. In art you will have some kids there to do it that are good and then you will have all the other kids. Lots of kids take art as a blow off.

All in all i think working with the kids there to do art will outweigh all the BS.