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I was watching GamebreakerTV this week (Guildcast) and the members of that show voiced an idea that I've believed in since the first Beta weekend. Basically, that the ending 'one off' events are going to be a feature to the game.
This coincides with the idea that was put forth very early on in the games design, which was that a dragon flies over, burns down a bridge. This signals a start to a large DE. Rather than having this on a timer, it could be a world wide event. The way each server then handles the event would lead to differing outcomes, different world states, etc. that might not necessarily culminate the same way.
Case in point. The end of the second beta weekend with the 'zombification' of the population. IF this was a world wide event, each server might have had differing outcomes (this would also depend on the resetting of the population when they log). But it's an interesting proposition, as it is possible for a servers world to remain in a particular setting's state for a long time.
The time it took Anet to design, produce, and implement "The Hunger Royale" is reported at roughly 12 hours. To me, if this time is actually even half true (let's say it took 24 hours to produce that event) that is still an amazing feat.
So relative ease of creation and settings that could leave each server in differing states based on a world changing in game scenario (a dragon flies over and changes the world in some way, a major forest fire occurs after a brutal attack by centours, etc.) make for an interesting idea.