I see the problem that in your system the most effective way to earn is just to stake and to go away. It doesn't matter if posts are written or not.

Currently, when self-voting of spam is balanced by down-votes, the rewards of authors and stakeholders will go down when nobody posts. so Stake-holder (curators) need to animate authors to write, so that they have sufficient posts to vote on.

I agree the system is complicated and it needs active downvoting of accounts that try to cheat proof of brain. Also the fact that I need to vote within the first 5 minutes for optimal curation rewards is not optimal.

There must be something in place to animate stake holder for reading and for rating content. Otherwise they will lose interest and go away, knowing they earn interests anyway.

I'm also seeing no need to store votes and posts data directly into the blockchain when there is no influence to the reward.

As a developer, I'm seeing also the problem that your idea needs a major code changes which needs to be applied in one hardfork.