Today, NBC — much like Chamberlain — is daft enough to believe that Mr. Leno’s demands will now cease. If history is any guide, this is unlikely. After pocketing Czechoslovakia, Hitler immediately took dead aim at Poland. Using the same game plan, Mr. Leno will soon go after Jimmy Fallon, who follows “The Tonight Show,” quite possibly demanding that NBC expand “Tonight” to its original 90-minute length.