Also I assume naturally income and blog quality is going to power-law distributed as well in any case, so we won't be able to widely distribute rewards in any case. The only way to widely distribute money is to make a few people very rich and the 85% get the crumbs.
The problem with Steem's voting reward algorithm is not that 20% get 80% of the rewards, but it is that the selection of the 20% is done by 1%. And this is motivating the wrong behaviors and focus of content produced.