MLIS is the new barrista*
In regards to the article, I suspect that in a place like Williamsburg, you will probably also find enclaves of hipster social workers, hipster health care workers, hipster accountants, hipster physical therapists etc etc. Actually, I think I'd rather read about hipster teachers or health care workers, because they probably make less than librarians and probably face greater challenges/stresses on a daily basis. Plus who makes $51,000 early in their career and if they're working in an extremely competitive job market like New York City? You get paid based on your highest level of degree and number years since you've got said degree, which means folks in their 20s-30s generally make the least amount of money in the profession.
* Credit goes to my pal Susan for the alltime classic quip of "Law school is the new barrista!" when I was informed that a former hipper than thou college classmate of mine had switched tracks from Mission District bartender to law school student.