There're plenty of poorly-paid, temporary teaching jobs in higher education. An MFA will help you get one. The more interesting question, I believe, is using the MFA to get a better paid, permanent teaching job with middle class wages. The growth in recent years of low-residency (summer) MFA programs, the growth in doctoral programs in the visual arts, bears investigation.
FWIW, most college-level courses nationwide are taught by instructors who are not paid middle class wages for their teaching/research/publication/service. A willingness to spend a year homeless while traveling the country is -- in a perverse way -- excellent preparation for a career adjuncting, excellent preparation for an impoverished old age.