Total speculation here, but having watched a lot of practice this year and talked with Mouse a few times I'd say that Kavanaugh has little chance of playing next year at QB.
Personally, I think barring more injuries or setbacks, Tygue is a lock. Remember, the coaches were higher on him than White before his injury.
If not Tygue, Hubel would have to be the front runner. He may not be as mobile but he's got a good arm and often looks the best of anyone in practice. He has also held up well in the games he has gotten into (see his TD drive Sat.).
Kavanaugh is hard not to like as a player, in that he has the attitude and work ethic of a leader, but he clearly has trouble throwing the deep go routes in practice and his passes often arrive late due to lack of arm strength.
It'll be interesting to see how the staff handles Hagan (and any other new QBs). If Jerry and Co. are planning to be around long-term it definitely makes sense to redshirt him but if they are high on him and think he can help them win now, who knows?
Again, just my thoughts...
Cheers.