I'm not sure I buy KP's story about all of a sudden not liking the direction of the franchise. I think they told him they did not plan on giving him the full max, and he threw up the deuces. Time will tell if that was a good call on the Knicks' part, but Scott Perry is a very smart dude who has great relationships with all the big agents. I don't think he'd burn a bridge in this way if it were not warranted to protect the franchise.
My initial reaction, as for most, was how lopsided this seemed for Dallas. As news trickles out and the picture is completed, I like this deal a lot for the Knicks and think it's extremely risky for the Mavs. Essentially, there is only one pathway to this deal being a success for the Mavs, and all other paths lead to complete disaster. IF KP comes back fully healthy and IF he can still play at the same level as a rim protector and IF he resigns with the Mavs and IF they can fill in cheap elite 3&Ds around Luka/KP (which elite 3&Ds are not cheap), then its a success. Anything less, and the deal is a disaster given the opportunity cost of all of those picks.
KP has now had two public blowups with his front office...perhaps both were warranted, but there's a pattern of behavior. Fortunately, Dallas' front office is super professional...oh wait.