It's definitely a QB centric league now. Getting to the conference championship as a JAG QB means you're on an incredible hot streak or the team has other things going for it, like dynamic playmakers or a killer defense.
I think throwing a rookie out as a starter -- especially if they don't have a good supporting cast or a good coach -- is a recipe for disaster. I think you almost have to sit them a year so they can learn the offense and how to be a pro.
It's a tough position to play well from the mental side, and I think that's why so many young talented QBs bust.