Listen, until this year he had the revolving door excuse. And, maybe that was a valid excuse even though I am sure he had some input in those moves. He has not really proven anything here yet. People also forget that the knicks-nuggets were not playing well prior to the trade and their defensive schemes were putrid in recent years.
He has been doing a good job in the past 10 games (Lin certainly made his life easier (and possibly saved his job), why not see how he does with this team through the playoffs? Why not see how they mesh, if they continue winning or if they even make the playoffs nevermind winning a round? Whats the rush?
Here is his chance to (continue to) make it work. If it all fails, will we be happy we gave him an extension? Will we just then blame Melo? Stat? Maybe even Lin?
Let's see it happen! I have the feeling it will continue to improve, especially with Melo's integration (with MDA's help).