I was surprised about that too, actually. When I first found this forum, I wanted to see what my first level university psychology text said about the MBTI - but it wasn't even mentioned; I think they tend to stick with the more 'empirical' tests (i.e. Big Five, MMPI-2, etc.) as opposed to the Jungian ones (although oddly enough, they taught the Freudian psychoanalytic perspective of personality, but didn't even mention Jung).
However, I went to a personality seminar given by a professor at my university (meant for people working in the work force - i.e. my parents - but I figured it would be about the MBTI, so I convinced them to let me come along too
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) and one of the main focuses was on the MBTI. I talked with the professor afterwards, and she told me that the MBTI isn't used so much in a research context (which would explain its absence in an introductory course) as opposed to a social psychology context. Apparently, there's a course which focuses on the MBTI for about half the term (which I want to take...and slack off in, of course). I don't think it's "going out of vogue" - moreso that it's used for a different purpose/isn't falsifiable (and so isn't as readily accepted or taught - but it is used often...apparently).