It would be neat if Channels had an audio-only mode available to users with a transcoding DVR -- either built into the Channels iOS app or as a separate app.
Some channel types (news, sports, fm radio audio-only cable channels, Music Choice) are especially suitable for audio-only consumption. CNN and Fox News, for example, are already available in an audio-only format on Sirius XM.
In addition to conserving bandwidth, an audio-only mode would allow listening while the Channels app is backgrounded. It would even allow listening in the car (especially if a basic CarPlay interface was offered) or over in-flight wifi.