Uh, the above was sarcasm. Travis isn't a lockerroom "cancer" sitting home in Florida, and won't be one for at least half the season, if he follows through with his threat to sit-out. And even if he WERE to return, his attitude has likely turned-off many teammates to the point that no one would care about what he was saying.
And I think it would be stupid to trade him right now. His value to other teams is presently a 4th rounder, which is better than it was at draft time. The Bills won't see his value go down any (unless something happens to him that they can't control) and it can only increase as more RB's go down.