2019-20 might be his last season. As for me, I'd rather seen him retired in Toronto Raptors' jersey.
Raptors deserve that, he was very popular in Toronto Raptors back then and Raptors was his first team in the league.
Also, I think it would somehow give some good news in return as Leonard departed from the championship team, we don't expect Carter to help a lot but it would help attract more fans to watch the game.
Last season, Toronto Raptors gave Vince Carter a 30-second standing ovation when he checked-in for the first time. They think that it will be the last season where they will see Carter in the Air Canada Centre.
This upcoming season, Carter, if ever will be signed by Toronto or not, will surely come back again at the arena. And this time, since he made an unofficial statement already about retirement, expect that the tribute video for him by Raptors fans will be longer.
I think Lakers is his best chance for a comeback. They have one more spot on their roster if I am not mistaken. I think he will be a last minute addition if the Lakers can't find another player to complete the team.
There are rumors back then about LeBron showing interest in recruiting Melo but no update about that rumor for quite a while now so maybe that was now removed on the list.
Carmelo, if he really wants to play again, should accept being underpaid, being a bench player and will just have limited playing time. Yes, he is still in good shape, at least, but no time now for his pride to take over again at any provided situation.