As far as i can see, it has to be a leader, who starts to do the first steps and takes all burden, at least at the beginnings. But it’s a lot of work. After that, “volunteers” may be join to help. I can’t see other successful paths without payments, as Sebb mentioned. I don’t think that it’s possible to do something like RfG from scratch with forum(or other public platforms) collective effort. Somebody with strong hand must decide where project should go.
Forum can give many ideas though 
And personally, I would be happy to join it as one of “volunteers”
