The only reason to trade him would be to make up salary on our end getting a big money player. The only way we get one of those is the disgruntled star scenario. Cousins seems like the best candidate for that right now.
If things go sideways in Sacramento this year, we we could offer something like Sullinger, Bradley, some prospects, 2-3 first rounders, and as many 2nd rounders as they can handle. Might be enough for Cousins.