Wasted year. Redshirt the guy if he isn't gonna start at QB and save a year. I'd be pissed too.
Well, did the kid actually believe that he would start? After a national title appearance?
As a coach, you have to have some foresight with these issues. If you believe the kid will be good enough to leave after his junior year, then you may as well play him. You waste a year when your redshirt sophomore leaves. I understand QB's can be different, but the concept is still the same. Also, the kid should want to go along with the redshirt plan as well.