In truth? Well, we can't just go about entertaining every idea for a potential forum. Particularly when that idea doesn't have any tangible example of it being warranted.
I would think that if people really wanted to discuss light novels and visual novels, they would've tried to discuss them by now aside from spoiling in a few anime threads here and there.
I really don't see what's so difficult of attempting to discuss them in an existing forum, and if we see that activity is good, then do some sort of accommodation. I think that's the best policy to have instead of having to scratch every itch anyone may have going forward.
As it is, I haven't seen much interest in this idea aside from 3 or so people.