Do we really want to discourage active users from actively using the platform? It's one thing to try to penalize bot abuse, (but they will just rewrite the code) it's another thing to discourage actively using steemit. People are upset that their posts only get a few votes now, it will be much worse when they start getting no votes on every post.
And that will be the result. Vast numbers of posts with no votes. Followed quickly by vast numbers of formally active users with abandoned accounts. I cannot think of any single change that will more quickly kill steemit than this one.