Well, I was actually just thinking of modifying the idea slightly so that affiliates are formed. See, sometimes the prompts that you see floating around are really nice, but you know that you don't have the stamina to write a full-story (in fact, you'd leap for joy if you could write even a single scene). So maybe, just maybe, if affiliates were around, there'd be more fic (so the theory goes, at any rate).
Maybe it's not something important to many, but to people like me who like really tiny fandoms (and you're possibly one of the only fic writers for that fandom as far as you know), it's really all about encouraging fic so that you can read something other that what you write, if you get what I mean.
Hence the motivation for wanting to create "scene comms" to affiliate with "fic comms", so that there will 1.be more prompts to write about, and hence more scenes 2.maybe help move some people from the scene to fic stage (and hence more fic).