Rabbi Emmanuel Gettinger was the Rav of the Young Israel of the West Side who was niftar almost ten years ago. He said that when he was a young man he thinks that he personally knew every single bochur in the United States who was learning full time [this was the 1940's].
Today?
WOW!!! ורבו לספור כי אין מספר!!
הודו לה' כי טוב!!!!
A lesson in the miracle of the resilience of Torah and Klal Yisrael.