Ignored, or the jobs just weren't there?
A department head once told me that she couldn't hire any new tenure-track faculty. Turnover at the school is so rare, and when a position does open up, there are literally hundreds of highly qualified applicants. It's been that way for decades, particularly in the humanities and arts.
She noted that among the existing faculty were several tenured professors who had been hired in the previous century when their respective areas of study were hot. Even though their expertise was outdated and students weren't signing up for their classes, they were still on the books until they voluntarily retired ... or died.
Fresh Air had a great interview with Glass in which he talked about his career and the various jobs he had to take as he developed his music. He was driving a cab in NYC in the 70s and he said it was very dangerous. It's the top interview in this list: