It's silly how because he has a West Baltimore tattoo or played a character from there in a movie, you're assuming that the Knicks weren't his childhood team or that he isn't now fully motivated and happy because he's playing in one of the best arenas in the NBA, in front of one of the best fanbases in the NBA, and with another top 10 NBA player.
Yeah, the Knicks point guard is older, Melo's never been on the All-NBA defensive team, and Amare has had knee problems in the past. But the Knicks also have two of the best scorers in the league, and Chauncey compliments them PERFECTLY because he is such a great knock-down 3 point shooter. They still have to upgrade the center position if they want to be serious contenders, and their bench is pretty thin, but I wouldn't be remotely shocked to see them knock off the Heat or the Celtics in a playoff round. Any time you have three guys who can put it in the hoop like Amare, Melo, and Billups, you have a shot.