This year is a wash. It's obvious Tyrod is not in the team's long-term plans...why not trade him for whatever you can get and give Peterman the keys for the year? If we can get a 4th/5th rounder and depth player I'd take it, as opposed to riding out the year with him and letting him walk. Then you give Peterman a full 16 to see how he does and if he can stick as the backup/possible starter for the future.
Shady only has maybe 2-3 good years left in him, barring injury, and is on a huge contract. By the time this team will be ready to be good again, he'll either be expendable or retiring. Why not get a haul for him while he still has value, and let Jonathan Williams start? RBs are a dime a dozen anyways. I get that this would piss off a large portion of the fanbase, but why not go all in, since you've already traded two of your best players for picks? Load up for next year's draft and beyond. I'd even look at trading Dareus to be honest.