From the looks of this article (which was posted on the forum a couple weeks back), It seems that Hillary Clinton is already preparing the groundwork for a 2016 Presidential run.
http://hollywoodlife.com/2014/08/05/hillary-clinton-campaign-president-running-2016/Getting back to the original question, I don't think that Hillary Clinton will become an outcast in the Democratic Party if she somehow decides not to run. Heck, it is also possible that Clinton's reputation might even improve in the eyes of some people.
