Erik Kwakkel is awesome. For more on the history of footnotes, check out Anthony Grafton's The Footnote: A Curious History (http://www.amazon.com/The-Footnote-A-Curious-History/dp/0674...) There's also Chuck Zerby's book, The Devil's in the Details.
A scholarly article without footnotes is like source code without git/mercurial history. Like the long tail in search, it's not about frequency of access, but the force of accountability that footnotes exert upon the main text.