An interesting question ! I think that we have to watch the distribution of the reward pool. I'm not a Steem expert (yet :p ), but I can see somes important issues in the protocol. Of course we still in beta mod so it's normal. We have to be patient and alert to make the protocol AND the community mature.

One of the most important issue I see is the fact that the (steem) power can be centralized in the hands of the richest of the community. Actually we are like a little familly, there is no (or almost) bad whales, but imagine if someone like Trump or a big bankster come in and decide to become a dictator ? With just a single 100% upvote this person could drain the totality of the reward pool ! I believe in the fact that the community can self-regulate the distribution, but actually it look like there is a big open door for mafia... When Steem will attract a lot a people the richest risk to be interested and we have to be careful.

I don't know what kind of solution could be implement, we should think about it all together.