I agree with trading LeBron, but it's a close decision. They're going to be heavy favorites to win the East again next season, so they only need one major injury to the Warriors to have a good chance at the title. I think the temptation is too strong for the front office, so they will ride it out and bank on the small but significant chance one of the Warriors stars is injured for the Finals.
After next season, Cavs are done, possibly for the rest of our lives. Maybe they are hoping for LeBron to get them something in a sign and trade, so there is less urgency to get a return for him before free agency. I think if the Knicks were willing to take LeBron now for Porzingis and the Knicks' next 3 first round picks, unprotected, Cavs would be foolish not to accept it.