Is it wise to become a high school teacher in this economy?

Particularly a high school English teacher.
My sister had gone to college majoring in Education, but had to drop out because of financial reasons. She wants to go back and become an English teacher for secondary education, which usually entails majoring in the subject you want to teach as well as education.
In this economy, is it really wise to become a teacher, with the economy the way it is?
What are your thoughts on this? What else can you do with a degree in Education/English?