I don't think there's any danger of it being cancelled. I have to admit I'm wary of paying my train fares for their Doctor Who event though - announced last week - taking place in September, it has David Tennant, but a rival event had already announced David AND Billie. When I was in the queue for LFCC it was the later I overheard being talked about, not the Showmasters/Massive Events convention.
Back to the LFCC, certainly the sheer numbers and different venue seemed to pose problems, so that will be a chalenge for them in the untested Excel centre, but it was better on the Sunday. I would have been out by 10am if I wasn't waiting for friends.