And you would be wrong. My local library is considered one of the best small-town libraries in the nation (I believe at one point it literally won an award for being the best) -- and does not have a certified librarian in a head position.
Also, to compare MLS librarians with MBAs in regards to the workings of what's under them is exceptionally unfair. Most librarians I know (a set which includes my father in law, who is a county library director, and two close friends, who hold MLS degrees) are extremely academically curious about new things they can do to make their libraries more accessible and attractive.