No comments means the ability to create a lot of bots or to increase the size of a bot army, just for the simple purpose of downvoting. Will it happen, no one really knows, does it happen on youtube, facebook, twitter, and other sites? yes.
Will the annoying little rep25 continue to downvote, yes, if they had to leave a comment would they continue to downvote yes. The serial downvoters will take full advatage of any advatage they are given.
They will no doubt get their increase in downvote activity, will it have any different effect than it does now, not likely. Are the large stake holders going to do any downvoting? not likely. So net change, advantage serial troll flaggers.
Maybe on trending, or against each other, but that's probably as far as that goes.