I think people will think he made a mistake coming back if he embarasses himself in the Olympics and that will affect his legacy. That's my opinion here!
But as you said, MJ came back to the Wizards and wasn't the same - but how often do you hear anyone talk about that when talking about his legacy? It's still always MJ one of the GOAT's, not MJ, one of the GOAT's but not as good as we thought because he came back too old for the Wizards... Would you agree with that?