The former King of Cable — who recently agreed to buy more than 27% of Charter Communications — has a bracing warning for companies such as Disney and News Corp that hope to keep raising prices for their sports programming. “You have an unsustainable model,” he told CNBC’s David Faber in an interview. About 80% of viewers would not even pay the wholesale cost for sports if given a choice, he says. And pay TV providers may offer that, perhaps by teaming up with Netflix. “This stuff is getting too expensive for too many households.”