Now to Wade, he is now 37. In today's NBA, I doubt there is a team that will still sign him just because he is good and still in shape.
It's is just a number, if he can still play and contribute to the team, he can still get a team to sign him.
Look at Vince Carter, he was still re-signed by the hawks for the coming season, and he will is already 42 years, way older than wade, and he is the oldest active player in the NBA now, and I also think Wade is still better than him.
https://www.usatoday.com/story/sports/nba/hawks/2019/08/05/vince-carter-signing-atlanta-hawks/1929465001/After a year-long recognitions, tributes by every team, showing highlights video across every arena, swapping jerseys, future retirement of his jersey numbers, special hugs, teary moments, All-Star specials, etc. much better if Dwayne Wade preserved his legacy instead. If he plans to make a comeback it should be now and then and not as 39 or 40 etc.
And compare him to Carter? Wade is a future Hall of Famer. Coming back from retirement at the age between 39-42 is not an appropriate thing to do. Like I said above if he will make a comeback he will just be a bench warmer. A comeback on a bench? lol. Look at Jordan, still a starter when he came back at 38 after 3 years of retirement. Since he is part of the Wizards franchise, he plays a big role there.
If people want him to come back then it should be now. He still has that power. But a year later or 2 he will surely slow down and will end up retiring the same to what will happen to Vince Carter. We don't want to retire Wade like that.