I think Booker is still pretty decent. However, with the emergence of Freeman and the pleasant surprise of Philip Lindsay along with Henderson and even Williams, the Broncos could offer him.
Right now, he is problematic for the roster. The Redskins are in desperate need for a back, and it seems like that would be the best way to deal with the situation.
I think they could get a 3rd rounder, maybe even a second rounder for him.