Having an established starting QB loosing his job to a young gun because of injury is not a new thing.
Anyone remember Drew Bledsoe, And the kid who took his job when he was injured, there was the same talk way back then. Cant loose your job due to an injury. Well it happened then and turned out pretty good for the pats. Hopefully it happens again now.
Might as well let it play out and hope Coach knows more than we all do.