I still think 2016 is looking fantastic for GOP prospects. Remember too, you can't look at 2016 the same way you look at 2012. Obama won't be running again, and the Democratic field is remarkably weaker than possibly any Democratic field since 1984.
I wouldn't be so sure. Andrew Cuomo, Brian Schweitzer, and possibly Hillary Clinton will make for a stronger field than 1988, 2004, and quite possibly 2012. And looking at how so many of the governors of the GOP's class of 2010 are crashing and burning, their field may end up being more limited and weaker than is obvious now. Remember that by 2016, Jeb Bush won't have held office in almost a decade, and the Bush name will probably still be toxic. Chris Christie has trouble holding his abrasive manner in check (such as when he recently called a Navy SEAL an "idiot"), and while it may be endearing in small doses, it will really grate on the nerves of Southern and Midwestern voters once they're exposed to it at length.