When they were going over possible judges, Howard speculated that they wouldn't go with someone that "unknown" and young like Demi Lovato. Let's take a look at the scoreboard, shall we?
Google Trends: http://www.google.com/trends/explore...0demi%20lovato
So, Demi overtook Howard in public interest over 4 years ago and is currently trouncing him.
How about twitter followers?
Howard Stern: 1,344,389 (ranked 859th worldwide)
Demi Lovato: 10,717,475 (ranked 28th worldwide)
If Demi Lovato is unknown, what does that make Howard?