Has CBS finally had enough of Charlie Sheen's wildman ways? You bet they have, and now sources tell me the network is having internal discussions to ponder if his mega-hit show 'Two and a Half Men' can possibly survive without him.

"CBS stock has been taking a beating during Charlie's recent meltdown," a TV insider tells me. "Charlie has become too big a risk to not have a backup plan in case he has another incident and forces production to be shut down."