Continuing the theme of understanding the demise of New York City's cafeterias, I found this article about the closing of another cafeteria, Garfield's, which was located at the corner of Flatbush and Church Avenues in Brooklyn. According to the article, it officially close on July 6, 1971, "after declining business had forced its demise."
The article goes on to reference the Dubrow's on Eastern Parkway:
"Garfield's, in its heyday, was known throughout Brooklyn, mentioned in the same breath with Dubrow's on Eastern Parkway and Utica Ave and Hoffman's on Pitkin and Saratoga Avenues, which are also gone."
(New York Times, July 25, 1971)