Larry King says he'll probably "fall over right on the set one night," but with just 18 months left on the 75-year-old’s contract, CNN has started planning for contingences, according to Page Six. The network’s top choices to fill King's shoes if he steps down are currently tied up in other ventures. Ryan Seacrest's deal with American Idol makes him too expensive, although Katie Couric's deal with CBS expires in 2011. Executives will also watch Joy Behar, who has a new show on sister-network Headline News. A final option is replacing a King with a King: CNN's "video wall guy" John King is reportedly a possibility.