Its a common trend with online games in general and (for some unfathomable reason) SC in particular. People disappear.
Sometimes its the SC. Even if they write that they already have a plan in mind or that they won't run without at least a notice that, unfortunately, is still not a guarantuee that they won't vanish. *mini sigh*
However, the same goes for players! However excited they are, I think every SC on this site had the problem of people just about disappearing in one of their stories at least once. I don't want to jinx anything, but you should be prepared to possibly add new cast members in the middle of a story because too many people dropped out and you need a replacement - just in case. Just, well, because if you are not, you might have your heart broken and think its all your fault. Believe me, its usually not.
The only thing you can do as a player or storycrafter is try, try again.
note: I am not stalking you *hides*
