This could maybe be mutually beneficial, but superstar-for-superstar swaps just don't happen in the NBA. It's just too much risk for the respective GM's, and plus, fans develop loyalty to their superstars.
Another interesting (and equally unlikely) point-guard swap would be CP3 for Kyrie. CP3 is a better passer and far better defender, so the cavs get better. Clips get younger and free up cap room (I think ~$5m) to sign some much-needed depth.