they might, but chances are that if you force people to move their dislikes into the comments, they're going to provide more information than just "downvote", and the top comment will be some variaton of
* "the information in this video is wrong"
* "i don't like the person who made this video"
* "this isn't the content i expect from this channel"
all of which is vastly more useful than just a downvote.
* "the information in this video is wrong"
* "i don't like the person who made this video"
* "this isn't the content i expect from this channel"
all of which is vastly more useful than just a downvote.