What is life without art? Try to imagine going through your days without ever hearing music, or never being able to see your favorite television show or movie ever again. Any work of art - any song, any painting, and any play - has to be created by people. In turn, those people must have been inspired by someone at a young age to develop and pursue their artistic talents. That's where art, drama and music teachers come in.
A personal connection with whichever art form you're teaching is essential - the job would become a thankless task without one - and a bachelor's degree in the same topic will open the doors to the top jobs for you. Surprisingly, a lot of the money to be made in this trade comes from teaching adults - people frequently wish they'd learned to perform when they were younger, and pay for classes in later life.