There were times in history when the death of a leader led to the destruction of the whole nation, as was the case after the death of Rabbi Shimon Bar Yochai, the author of The Book of Zohar that was concealed from humanity for many years.
The righteous one had fulfilled his mission, but did the following generations continue his work? That already depended on the general state of the world and on its willingness to advance.
The same thing happened after the death of Baal HaSulam, who died in 1954. He was survived by a small group of students headed by his son, who continued to study in seclusion. It was only about half a century later, a long period of time, that new students began to join them.
In principle, all this is a very complex system, which cannot be understood in advance.
From KabTV’s “Secrets of the Eternal Book” 6/24/15