Yehezkel records a harsh prophecy directed against the kings of Israel, the nation’s leaders, whom he compares to shepherds who do not tend to their flocks. In the future, the leadership will be taken from these shepherds who failed in the past to properly lead the nation. God Himself will gather up the flock, rehabilitate it and hand it over to a different shepherd who will fulfill his role faithfully.
The new shepherd will be a descendant of David. However, the present model of leadership will come to an end. It will not be a mere technical replacement of personnel, but rather a fundamental change in the essence of the role. Therefore in speaking of David’s future status he is not referred to as “king” but as a “Nasi” – prince.
Since the institution of kingship has failed, an alternative form of leadership must replace it. One of the roles of the king of Israel is to bring about a situation that will facilitate the Divine Presence coming to rest amongst the nation. The kings of Israel, as depicted in Sefer Yehezkel, brought about the opposite situation: defilement and the distancing of the Divine Presence. Now it is too late; there is no repair for the corrupt kingship, and therefore it is replaced by the station of the “Nasi.”