The Knicks are on a hot streak, for sure, and they will come back to earth a bit.
However, it is also notable that they had a very good off-season. Although we all make fun of them for getting older, the truth is all the players they grabbed are efficient. With Amare injured, the Knicks don't have any particular weakpoints, although obviously with old age the potential for things to go wrong is clearly higher.
Basically, they pulled the same move Danny Ainge did two seasons ago, grabbing Shaq and Jermaine. When they were healthy, we were nigh unstoppable, but unfortunately injury happened. If the Knicks are lucky with their injuries, they can have a great regular season with Melo at PF and everyone else just playing competently.