Visibility of posts is one of the main issues currently. Right now you get visibility by either having thousands of followers, or by getting to the trending page. So pretty much the same group of people get most visibility (and hence most rewards). Both these ways of getting visibility are positive feedback loops - the more SP you have, the more easily you get to the trending page and the more SP this makes you. And the more following you have, the easier you get to the trending page and others resteeming your posts, so the more followers you make.

You can see how this leads to power/influence/rewards being concentrated into the hands of a limited group of people. The more you have, the easier it is to get more.

It's a problem with all cryptocurrencies (that I know of). There is lots of talk in the crypto world about the blockchain revolution being "the greatest redistribution of wealth". As I understand things, wealth will consolidate into a new limited group of people very quickly. So, the way to solve that problem is not by redistributing wealth, it's by designing a system that removes the problem.

So here are some potential solutions (or directions to look into):

• The communities functionality: this will lead to the posts of more authors becoming more visible/findable. So the upvotes during a given day would be more evenly distributed across the posts created in that day (hint: use that or a variation of it as a metric).
• Provide other ways of gaining visibility. Here are some ideas from me. You can also rework the trending page in various ways. State the problem in a scientific/engineering way and you will come up with solutions to make it easier for quality content to become visible.
• Curation groups are currently saving Steemit's ass, in my opinion. Not sure if I would be here without them. So make things easier for them. Ask what they need and deliver. Brainstorm together. My post linked above has suggestions.
• Change the rewards curve so that it makes little sense to hold ridiculous amounts of SP. Try to come up with a number (a few million SP, one million SP, less?) beyond which you don't get more influence on the platform. This can act as countermeasure for consolidation of influence into few individuals. If people try to hold millions of SP into multiple accounts, measures can be taken against that as well (like, every account with over 1 million SP has to prove its identity to the community when voting - it can be worked out, not too easily, but it can be, especially with the help of trustworthy communities).

I would not suggest Steemit, Inc. disposing of its massive SP stake yet. The platform is still too vulnerable to abuse, and someone could even overtake it. The platform has to show that it can solve its problems on its own before it's left solving its problems on its own.