I hope Sargeras, and it is a once only fight, that everyone on the realm takes part in, leading up to the final day, where he finally succeeds and destroys azeroth, causing your server to shut down forever.
Imagine a whole expansion leading up to the end of WoW for good, closing down your server as you join up in some kind of final battle over the course of a week, and on the final day, the cities crumble, the lands turn to ash, and each zone becomes uninhabitable, and everything becomes unmade.
I would pay good money to be part of that
Server Message: The Auction House has been irreversibly destroyed, and no longer functions.
Server Message: It is no longer possible to create new characters, as everyone is now in a final battle with extinction
Server Message: The world has been claimed by Sargeras. It burns to ash as your soul leaves your corpse for the last time, leaving behind a dead universe filled with nothing.
Then rolls one heck of a final cutscene, think end sequence to Final Fantasy games in length, and then, the credits. You can then view your armory profile as a memorial, locked forever.
What do you think?