You could argue Reddit is the natural evolution of Digg, the latter having destroyed itself. But Reddit has matured more or less through expansion and at this p

You could argue Reddit is the natural evolution of Digg, the latter having destroyed itself. But Reddit has matured more or less through expansion and at this point has seen its own splinter groups formed via Voat and others. At this point in time, an "improvement" to Reddit might be something that makes Reddit obsolete all together, perhaps by making the upvote/downvote system seem old and archaic in comparison to something that provides similar, but more robust content promotion.