The negative space left and right is to ensure an optimal column width. If there is nothing important to place to the sides, anything added there would serve only to distract from the flow of article content. That is to say, filling space for no reason is unreasonable.
Pagination is its own thing, and I won't comment one way or another on that.
[1] http://graphicdesign.stackexchange.com/questions/13724/recom...
[2] http://ux.stackexchange.com/questions/3618/ideal-column-widt...
http://baymard.com/blog/line-length-readability
I usually like reading articles with this width, but there's usually a different color background to differentiate the article from the page so there's not this huge white-space void.
Other than that I thought the article easy to read.
Sorry for off-topic.