I know this will be seen as a UNC/NCSU debate so I hope to keep it civil and on topic, but why would Dave deserve it over Mack?
Simple answer if I am an AD... which one is likely to stay and maintain stability over the course of the extension. Mac is old as damnit.. he ain't long for the job and the incoming athletes know it. He has done a great job of reestablishing some semblance of recruiting and at least bringing them back to the over hyped underachieving, middle of the road juggernaut that has always been UNC football but really not much more than that.
That is not to say Doeren has lit the world on fire, but he has won more conference games than anyone on the sidelines at State ever has. In a what have you done for me lately world that matters.
Not sure I would give either of them a big extension at this point.. If Doeren can keep it going for a couple more years.. maybe.. if Mac can keep getting recruits for a couple more years, you are ready to hire a hot shot replacement to win with Mac's players as he rides off into the sunset.