We are lucky to have TB as a backup. He's better than some other teams' starting QB's.
That being said, I do not think it is a good idea to bench Carr at this point. He needs the reps to continue his learning process. And the more game-time that he and his receivers get together, the better. You never know what plants will grow into from the seeds you plant today.
"Football is only a diversion." ~ HOUSTON TEXANS