As much as it may hurt to consider, WoW will one day end. It's unfortunate, but all good things must come to an end. There will be a point when Blizzard realizes that it is no longer economical to keep the WoW servers running. It will flip the big, imposing, red switch, sending all the servers offline for the final time. But knowing Blizzard as we do, such a monumental event would not take the form of an unceremonious shutdown. There would be spectacle, and lots of it.
Given that Blizzard would be shutting down the servers because they yield no economic benefit, putting development time into a great sendoff would be highly unlikely. As such, we would be stuck with preexisting world events. That still leaves a lot of room for shenanigans, however. Would Blizzard bring the zombie invasion back? Perhaps The Burning Crusade launch event? Raid bosses all over major cities? Or (my personal favorite) perhaps a conglomerate of them all: zombies aflame with fel fire disrupting major cities, creating rifts that require an entire server's effort to close? With the Lich King in the center of it all just for grins? Sign me up.
There are so many ways to give WoW the send-off it deserves. How would you do it?