You’ve read all of your free items this month. To register, get added benefits and unlimited access to articles, Become a Member. Already a Member? Sign in. Advertising Age Article Abstract Can 'Idol' Survive Without Its X Factor, Simon Cowell? Exit of Popular Judge Could Accelerate Slipping Ratings, Ad Revenue for Fox's Cash Cow By Andrew Hampp, Published on December 29, 2009 3 Want more Access, Content & Connections? Upgrade to Membership. We are glad you are enjoying Advertising Age. To get uninterrupted access and additional benefits, become a member today. Become a Member Already a member? Log in.