Deceptive Memories and Yeridat Hadorot

A recent comment on R. Natan Slifkin's blog discusses an idea I've been thinking about a lot lately. See the third paragraph of the November 18, 2009 5:09 AM comment of G*3 to the post http://www.rationalistjudaism.com/2009/11/yeridas-hadoros.html. Quite well put. I don't necessarily agree with the rest of the comment.