In all seriousness, "Mitt '16" sounds a lot like "Kerry '08". I seem to recall the media taking the latter very seriously as well, and consistently claiming that Kerry was "doing what he needs to do" in order to run again in 2008.
Republicans hate Obama as much as Democrats hated Bush eight years ago, and there will be a section of the party that blames Romney for Obama's reelection, although Republicans do seem to have more respect for Obama's political talent than Democrats had for Bush.
Kerry's biggest problem was the 2008 primary field. He would have been the third choice, at best, in a field that included a young African American Senator and a female Senator with 100% name recognition and a popular husband. It ended up being a long hard-fought primary, although that was between figures Democrats generally liked with similar policy positions.
The 2016 Republican primary is likely to be more divided, which leaves more openings.