When I first joined the forums, I was surprised there weren't more readers here (at least in comparison to creators).
I think it would be neat to have more discussions by the readers, but I can also see how that could be opening a can of worms. I noticed that talking about other people's comics here in any way that isn't positive or constructive is usually frowned upon. And a lot of people already deal with negative comments on their comics, so a discussion about their work without them being involved might be kinda... unnerving.
I do think the forums lack a reader presence though, and it would be nice if more of the mobile readers could access the forums easily, since that seems to be where the majority of them are.