It's even worse today. The amount of interconnected systems we have in play would be absolutely chaos to try and separate.
We didn't have to worry about power grids, networking, food was FAR more local, it would take years to try to isolate yourself from it all on a statewide scale.
There's a much simpler reason.
CNN is hemorrhaging viewers. Bernie draws crowds. If you want people to tune in so advertisers think you're useful you gotta find something to bring an audience.