I just don't see a point of trading Kemp, his value is rock bottom right now. However, I know that's Colletti's MO, trade them when their value completely sinks,
Going into 2015 this should be the OF, IMO:
Bench Van Slyke
Bench Crawford (Hopefully they can trade him, but doubtful)
Ethier is the only one that has value, however he is an overpaid platoon player at this point in his career.