I'm going to stick my neck out a bit here:
I wasn't at the World's in Hurghada so my only knowledge of what it was like is from the posts on this forum and from a few athletes that I know who were there.
I think that the most important thing to take away from the event is the knowledge and experience of the mistakes that were made and to build on them for following events. It is very easy to point the finger of blame at Yehia, the other organisers involved, and AIDA, but that really does not solve anything and creates a lot of negativity that is counter-productive. Unless you have spent time in Egypt, you will have no clue as to how greatly the culture differs from our 'Western' culture, and how this in itself, makes things infinitely more difficult.
It would be far better for a selection of people who were involved at all levels, together with representatives from AIDA, to sit down and go through the past few weeks with a fine toothcomb and examine the details to the nth degree - not just the event itself, but the promotion/marketing involved in the run-up to the event as well. This would set the scene for building a solid foundation for any events that follow, upon which you can build greater things.
I think the fact that many people pulled together under very difficult circumstances and to take on roles that were not meant to be theirs, in order to make the event happen, is a testament to the passion that people have for this sport.
I could say more, but I am not going to bore you all. Apologies if all this seems like common sense, but no one else has said it yet.
Mike