Quite frankly, I feel the annual 'Play the backup!' argument we see every year is one of the dumbest things on the message boards. None of us has access to how these guys perform on the practice field.
I guarantee you if someone is clearly outplaying the starter day in and day out on the practice field, he's gonna play.
Not sure it is any dumber than a head coach saying a starting QB will play the next eight games - or any position player for that matter. After 1/3 of the season I cannot think of any instance a coach should come out and say so and so will be playing the balance of the games this year.....sorry I do not agree with that line of thinking or instilling that level of comfort for any player. Of course I don't earn $4M per year for a 13 year body of work that is challenging C+ performance.