Advertisement Cable networks used to be incredibly valuable. But in the streaming and cord-cutting era, they are in decline.That's why Comcast is ditching almost all of its cable networks into a new, stand-alone company.It would like to convince other cable TV owners to join in.One of the country's biggest cable TV companies doesn't want its cable networks anymore. Would you like them?That's the pitch Comcast is making Wednesday as it announces plans to split off almost all of its cable TV networks into a ...