I don't know how FFXIV can possibly survive the impending disaster that is TERA, Blade&Soul, Star Wars, Rift, Guild Wars 2 and so on, without doing something that those games aren't doing. But, currently, all of those games do everything FFXIV does, and they do it better (apart from crafting, which is FFXIV's only strong suit at the moment).
FFXIV needs to differentiate itself and tap into the almost untapped market potential of Sandbox gaming if it wants to survive.