While this will bring some outcry, as usual, the reality is that advertising on that platform is cheap. As we all know, Facebook has alienated many audiences, including a lot of people here on Ello, but this particular move will not likely cause much concern, except for a few brands which are impacted.
However, it is certainly part of a larger trend of things that Facebook is doing. The push to drive their stock price is sure taking this network a long way from a pet project in a college dorm room.
Having the world's largest social network is certainly a large asset, but Facebook best remember that you need more than people to be the product. If they are going to continue to thrive, they best take care of those people along the way.
(Here is the New York Times article for more detail: http://www.nytimes.com/2014/11/15/technology/facebook-to-cut-unpaid-posts-by-marketers-on-news-feeds.html)