I doubt very seriously they'd even consider dealing him for that little.
Pickens is both younger and more talented than most of the other WRs who were traded the past few years. Ultimately his value can't be less unless teams are just convinced he'll mail it in after he gets paid.
Bills got a 2nd rd pick for Stefon Diggs + they gave up a couple late picks...(this was the 2nd time he was traded, the Vikings got even more for him)
Calvin Ridley netted 5th and 3rd rd picks, and he was suspended.
Marquise Brown and a 3rd rd pick netted a 1st.
AJ Brown netted 1st and 3rd
Tyreek Hill netted 1st, 2nd, 4th and then a later yr 4th and 6th (ridiculous amount)
Devante Adams netted 1st and 2nd rd picks.