Essentially I'm thinking something like you subscribe to this rotating reddit, where the subscription just points to new reddits each day (kind of like "subreddit of the day" pointing). This way you could get exposure to new reddits all the time.

It would also help people new to reddit to understand the broad diversity of reddits that exist.

Probably some reasonable constraints might be that reddits can opt out of rotation, "location" reddits (city/state/country/university) and nsfw reddits could be out of rotation. Whether everyone gets the same reddit (driving maybe one wild spurt of growth in that reddit) or everyone gets a different reddit from the list... could be a discussed option.