The Koch gang wants Ryan. The fetus fetishists want Santorum. The Looneytarians will want Rand Paul. The latter two groups were ordered to shut up and do what they were told in 2012 to run the "electable" guy and they not only lost, they were shellacked. They're not going to sit down and shut up in 2016.
In fact, I'm expecting the cameras to turn away from the occasional fistfight on the floor.
2012 saw them shocked and dispirited. That's not going to last.