I think that's all part of the crowdsourcing. If someone is using downvotes as an attack against otherwise valuable content, then the community can step in and upvote it. Often I've found that people who are the target of unfair downvoting can appeal to the community and come out ahead of where they started in terms of support and votes.

Also, i'm not necessarily saying that what i'm proposing will work, i don't think anyone knows that for sure. But my guess is that it would work better than adjusting numbers in some algorithm, and i think the experiment of the Steem platform as a whole is about crowdsourcing rewards more than algorithmic rewards, so I would like to give it a real shot.