OK? Golden Pagoda was in the first iteration of Mists of Pandailya. Then there was Operation Stonewall, then Isle of Thunder, then finally the oh-so-beloved Timeless Isle.
Looks pretty apparent to me that Blizzard did not give up on open-world content.
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Over flying. Really?
They pretty much corrected their mistake immediately with heroic dungeons. They corrected their dailies mistake over the course of three patches in WoW.
It's an iterative design process. At no point in this game's history has Blizzard just given up designing the game because of fickle complainers who can't ever be pleased.