If the C's trade Kemba, I bet most of us (the fans) won't like the trade. If we keep him till he enters the final year of his contract, chances are we will get way better value. For instance, look at 35-year-old Kyle Lowry. According to rumors, the Raps could have gotten great value for him at the deadline. They opted to keep him for sentimental reasons(?), but that's another story.
Having said that, Brad should definitely explore the market. Imo, our best trade partners this offseason are probably the Clippers. If they lose to the Jazz, they may become desperate (especially since Kawhi has a player option). Obviously Kemba is overpaid, but he may be the best player they can realistically get. I mean, he was an all-star starter for 2 years in a row prior to this season. He's still a legit scoring threat as a PnR ball handler. I reckon he'd be a nice fit alongside Kawhi and George. If the goal for the Clips is to win a ring no matter the cost, Kemba fits the bill.