Has Israel ever experienced the fullness God has planned for them?
No, Israel has never attained the fullness God has in store for them. Their fall and diminishing brought riches to the Gentiles, but their fullness is still future. It is coming, though they will first pass through horrible times.
Les explains that Israel's fall and diminishing brought riches to the Gentiles, but their fullness is still ahead. He emphasizes they have never attained the fullness God has in store, yet it is coming. He warns not to sell the Jew down the river, because they will go through horrible times, already being backed into a corner and frantically trying to make peace. He compares modern Israel to Israel at Samuel's time, wanting to be like the surrounding nations and seeking a king, and notes Israel's government seeks acceptance by the Gentile world.
Now if the fall of them be the riches of the world, and the diminishing of them the riches of the Gentiles; how much more their fulness?