This is a change we have been looking at for a while. I did an audit and the downvote system didn't have any instances where it improved community interactions. They contribute very little and yet are used as a vehicle for some people to promote conflict without providing anything useful. If someone disagrees with a post, they can use their words and let the OP know why. Having an explanation if someone disagrees rather than an anonymous downvote makes for a much healthier environment for everyone involved.