Won't change much, unfortunately, because when he votes, he always gets something back. And if he knows how to vote, he will always win.

That is because the rewards are distributed. So even if one downvotes a post 1 HIVE, to counter another upvote of a specific account of 1 HIVE too... the 1 HIVE that is being removed is from everyone... hence, depending on total post value, it might be irrelevant.