In response to what canustakemyheart said, I think someone should just start it, and then the rest of the plot, none of us will know. We just write a chapter in addition, sending the story in the direction we wish to send it, and then the next person can change/go along with it the way they'd like. That way, it keeps it exciting...
Just my opinion, I'm willing to go along with a certain plot as well if that's what everyone else wants.