Thanks!
I think that ad-revenue for authors will come, for popular authors at least, but it needs the best content (or the most popular content) to be recognised and hitting the trending page (or other platform UI display equivalent) so advertisers get a better impression of Steem. Which in turn needs the voting / rewards / curation system to function.
And there probably needs to be some kind of audience measure too. It's hard to know how many people actually read any post!
Thanks for your reply. Sure hitting the trending page is also important, but any good system has their own tracking function, so they can actually measure the effectiveness or visibility (I worked at Facebook before in ads.) To be honest, decentralized proof-of-brain is impossible. Think about the situation that there's no utopian voting at all :) Thanks.