I share usually a single channel directly when asked for a recommendation, but the ability to share multiple channels at once or for backup purposes does make sense.

I feel if a solution for this could potentially be a YouTube social network if it implements networking features such as 'Your friend John subscribed to this channel, Jane recommends this channel to you, Sync your YouTube subscription with Devin' and marketing using YouTubers i.e. I feel YouTubers would be willing share their channel recommendations using this network as current 'Featured Channels' section seems to be limited.