The only time keeping a rookie qb on the bench is when you know he is going to get demolished by the first few defenses, and that breaks a fragile ego.
I'm not saying Haskins has a fragile ego, but our first 5 games this year are brutal, for that reason alone I would consider sitting him till the mini bye after the Vikings game. Besides I'd like to see Keenum beat the Vikings
No need to start our rookie qb against all 3 division opponents in his first 4 games, and possibly let them get into his head. Play the Bills, Jets, Lions and Panthers first before meeting the division.