Bring back the Reithian ideal.
Reith's concept was to mix and match, so the viewer turning away at the end of Eastenders would have their interest caught by the programme on historic cartography. And the person who'd only switched on for the historic cartography would find themselves wandering into the music programme or enjoying the property porn.
He aimed to give the viewer what they didn't know they wanted until they saw it.
All this fragmentation and specialisation has undermined that serendipitous exposure to new things. Our worlds are bursting with choice these days, but we can actually navigate increasingly narrow-minded paths through them. Don't get me started on personalised Google results.