I think that's just wishful thinking on your part. I can't see any way the event won't go ahead. (Excluding natural/unnatural disaster) If it's going to make them money, even if it short changes people, what possible reason would they have to cancel it? I've certainly known more respectable organisers say numbers are limited to encourage those who've not booked yet to make up their minds quickly, and the claim of rare or first time guests could be read as don't expect any more main cast, but I really can't see numbers being that low. I'm more concerned about their Doctor Who event, but if/when that's cancelled don't proclaim its a domino effect that will effect everything else.