The retention issue may become a big problem. There are already alot of newer users getting discouraged after a few weeks of contributing and seeing their posts earn pennies. Hell, my posts earn pennies and I'm an experienced writer. Though I'm here as much for the social experiment as anything else, even I've gotten annoyed by it.
For now there is enough influx of new users that it won't be an issue, but that's not the answer. Then it would just be a user ponzi scheme.....new replacing old on a constant circle to keep it afloat.
RE: STEEMZINE #22 - STEEM Where Is The Floor? The Fate of Steemit Is On The Line