Interesting idea, I suggested something similar a few months ago, but instead of just assigning voting power the extra voting power was given to people that received votes from large accounts or large numbers of users.
This would create a trickle down effect and allow highly voted authors to pass on some rewards to articles they thought deserving. This would expand the voting into new areas that these authors are interested in, loosening the steemit\developer\crypto centric topics that steemit defaults to. It would also require minimal changes to the current reward structure, because it only adds 'upvotedpower' rewards without changing any of the other rules.
Here is my suggestion post from the old days, 2 out of 3 ain't bad! https://steemit.com/steemit-ideas/@bbqbear/rewards--add-a-little-trickle-down-economics
Thanks will give it a read when I have a moment:)