There should be a way to reward posts older than 7 days, based on hits/views alone. Something similar to Youtube, since steemit searches on google is on the rise and attracting alot of hits on steemit content.
Authors should be rewarded for direct views. And that I think is as important as distribution of stake.
For the stake, just distribute to active users and also for sign up of new users.
RE: How should Steemit Inc decentralize their stake?