He's not a developmental player. He's a veteran that's played below average for 2 straight years. Bengals beat writer says he is a backup next year.
https://twitter.com/pauldehnerjr/status/817057183749853184
You can replace Hill's 11 PPG in a PPR league very easily. Rashad Jennings, James White, Darren Sproles are guys people don't even want and they produced about the same. Fat Rob and T West were free at the beginning of the year. Why hold a guy like that when his name value is still somewhat high?
You can replace Hill for free (probably with a player already on your roster). The success rate of the 2nd is low but still higher than Hill's chance at bouncing back to what he produced 2nd half of his rookie year. If you believe that you should sell.
You can treat your roster like lotto. You have to buy a lot of tickets to get winners but if the winners are big enough you are set. What is Hill's upside in 2017?