The really good/excellent/outstanding students in the fields of Industrial Design, Graphic Design, and Photography were not talking about teaching, rather just interested in getting a job in the profession of choice.
The Art Education students who were taking Basic Design and other elementary classes DID want to become teachers. They were teachers first and then "artists" second. Occasionally, we heard in the hallways the now infamous quote " those who can't become teachers" or words to that effect. Probably in some cases that's true either out of incompetence in the field, other circumstances like having a steady income and benefits from a University, or just wanting to give back and share knowledge gained in the field.
Oh and by the way, I was a graduate teaching assistant for 2 years and Instructor for 1 year before I went into industry as a professional Industrial Designer. I wore a whole bunch of hats in that endeavor as well, Research Assistant in Human Factors, Product Designer, Automotive Designer, and Creative Sculptor.
The BEST teachers enjoy the process of enlightening minds and sharing their knowledge and challenging their students to think outside the box. I had some of the BEST in the World., even world famous ones. Richard Hunt who makes welded sculpture out of Chicago, for one.
Oh and by the way, I have never owned, run or managed a for profit company of my own. Woodworking has always been a passion, a hobby and a necessity as a home owner. I probably don't have the business mind it takes to be profitable AND I like my projects so much after the time and money invested it's difficult to part with them.
That's just my point of view.