Yes indeed, how popular is Hillary?
When Hillary ran in the 2008 primaries, she had some of the highest negatives ever recorded for a major presidential candidate, in polling at the time. And we were seeing revival of all of the Clinton era scandals and negatives about the Clintons being re-hashed. Wouldn’t the same happen if she runs in 2016?
Also, there is a new generation of up and coming Democrat politicians, such as Cuomo in New York, who want to run for president. Sort of like Obama in 2008 was a younger ambitious politician with connections and desire to run, there are others out there who would like to push Hillary aside and run in 2016.
Hillary was inevitable in 2008 and was pushed aside. The same could happen in 2016.