http://www.aish.com/literacy/concepts/Divine_Inspiration_Part_Two.asp
Prophecy is very difficult to attain when the Ark of the Covenant is not in its place in the Holy Temple. Therefore, when the Temple was destroyed and the Ark permanently concealed, prophecy became very difficult.
Moreover, prophecy can only exist in the Holy Land when it is inhabited by the majority of Israelites in the world.
Therefore, when the majority of Israelites refused to return to the Holy Land in the time of Ezra, the land ceased to have its special status with respect to prophecy, and prophecy ceased to exist.
However, it will be restored in the Messianic age, when the majority of Israelites once again live in the Holy Land.
- Rabbi Aryeh Kaplan