After going to the fanfiction panel this past year, being a writer myself, I talked to some friends that had went and from their ideas, I came up with this idea of how to revamp the fanfic panel::
Older and more experienced writers (i'd love to be part of this) are set-up around the room like little stations. A group of 2-4 younger, newer writers or those looking to get into fanfic writing can sit with an individual and have a Q&A time. During this time they can ask things like "how do you cope with writer's block?" or "where's a good place for new writers to start out?" "how do you get noticed?" "how do you get unstuck when working on a big project?" "how do you even begin to start writing?" and other related questions like that.
They could even bring in snippets of their work and get --constructive-- help from the elder writers. This isn't a time for them to go "omg help me with continuing my 19-chapter epic" it's a time for them to get help be it in grammer, storyboard, and figuring a style that's 'their' style.
I think a more individualized approach would be much more effective for a fanfiction panel. It would be a chance for those who have been at it for several years and know the ropes to help those just getting started or those who need a little nudge to fix problems that could be holding them back.