Turn answer into comment
Or "how to stop new users from posting comments as answers."
One way to cut down on the number of comments/questions being posted by new users as answers would be to create a quick and easy means for a user with moderate yet sufficient reputation to move said answer to the question's comments (or even another answer's comments). This quick and easy way could be a button in the answer titled
move to comments or something.
For example, in this question, a new user wanted to know if the question asker had found a solution to their problem, but since they lacked the reputation necessary to made a comment on the question itself, they asked it in an answer instead. This should have obviously been made as a comment on the question, but the person asking the question lacked the reputation necessary to do so.