CBS has several strong contenders among its comedy pilots, which may embolden it to drop most, or all, of its existing half-hour shows except for How I Met Your Mother, The Big Bang Theory, and Two and a Half Men (contingent on making a new deal with star Charlie Sheen, which appears likely). That way the network can introduce 3 new comedy series in the fall.
There are some rumblings that another CBS series, drama Ghost Whisperer, might transition to ABC. While it may look like a repeat of the Medium network switch last year (when the CBS Studios-produced drama was picked up by CBS after being canceled by NBC), the case with Ghost Whisperer is not identical. Despite being developed at ABC Studios, which runs lead on the show’s production, Ghost Whisperer is a co-production with CBS Studios, giving CBS and ABC an equal financial interest in continuing the show.
(Ghost Whisperer was sold domestically to a trio of networks -- Syfy, We and Ion -- and does very well internationally.) So the future of Ghost Whisperer comes down to what CBS wants to do with Friday night. Indications are that, despite the ratings meltdown the night has suffered this season on all broadcast networks, CBS intends to keep on scripted programming for at least a portion of the night. Given the fact that no one has been able to launch a successful scripted series on Friday since CSI premiered a decade ago, CBS has the option to stick with Ghost and/or Medium. (Ghost Whisperer has the ratings edge, but Medium is fully owned). Or send a veteran there for retirement, like… the original CSI.SOURCE