1) Why do you think the Radak would have expected Bnei Yisrael to understand the connection between the drought/other difficulties and the rebuilding of the Beit HaMikdash. If there was no Nevua, why would we even expect them to see the relationship?
2) How should we, today, interpret world events? How are we supposed to know if and when HaShem is sending us a message?
a) Read "The God Who is Revealed Through Historical Events: Rav Kook, Rav Amital, and the Interpretation of History" by Moshe Maya - http://www.vbm-torah.org/alei/14-04maya-history.htm. What is Rav Amital's perspective (s)?
b) Read "The Religious Significance of the State of Israel" By Rabbi Yair Spitz (he was in Memphis for a few years) http://ytyh.org/lesson/4. What is Rabbi Spitz's criteria for seeing G-d's hand in history?
c) What is your perspective?