And ultimately guild halls, new meta builds, condition builds, new types of encounters, revamped AI, a new profession, new specializations, new weapons, new trait lines, masteries, legendary scavenger hunt, and even gliding aren't going to give us much more to do if there isn't a significant amount of new events, story, and exploration to do. Well, unless you're one of the players who is content to go grind old content all over because it now has a precursor at the end.
ArenaNet has played up a lot of the big changes to the game, but been very secretive about just how much new world this content is going to add. Doing old content with specializations and even the Revenant is only going to give a limited amount of life to the game. How much playable content is a huge factor in whether HoT is really delivering $50 more worth of playability to the game.
Maybe ArenaNet is waiting to blow us over with the jaw-dropping size of the new region that is being added with HoT. At this point, however, their silence makes it seem like they are trying to avoid the day when we all go, "is that it?"