God I hope its a trade, but we all know that won't happen. Even if by some miracle this management group doesn't double down on their mistake and instead hands him another 1 year deal (perhaps through arbitration), he will be a UFA in 2018.
Players can be sensitive sometimes. If they see a team balk at committing to them long term they won't show the same loyalty come free agency time. We're really stuck with bad options across the board. Its either sign him to another 1 year deal and likely lose him as a UFA, sign him to a massively inflated long term contract (most likely scenario), or trade him away for pennies on the dollar, knowing full well only a handful of teams will want to use a protected spot for him in the expansion draft.
Player for player this wasn't necessarily a horrible trade by this management group. But when considering all the contract and expansion draft implications, it gets ugly quick.