I'm really not enthusiastic about trading JB at the height of his career for a downgrade in immediate talent.
I was in on Giannis. But, barring that, there are a bunch of different avenues I would have explored before trading JB, including changing the coaching staff, and moving just about anybody on the roster outside of Tatum and Brown.
If a trade brings back comparable talent, fine. But if it's picks and middling "prospects", it's a failure. A Mookie Betts / John Henry type of deal, which wouldn't bode well for new ownership.