If he's healthy this year and puts up 1.000 yards, he would be a good value for a team at $15 million for one season. Anway, whoever you are trading him to would not doubt want to negotiate a contract extension before making the trade.
Obviously the risk is that he gets hurt this year and his value tanks. But, unless we can get a late first or early second for him this year, I'm willing to take that risk.