And, truth be told, LS does accomplish its purpose: giving people a reason to log on every two weeks.
But many players are getting tired of this "treadmill": the Living Story does not offer any new gameplay, any new races, any new weapons, any new classes, and just one new skill (and a lackluster one at that).
Expansions are not just about new zones and new mobs to fight. Expansions change the game, usually with new races, classes, skills, weapons, etc.
Games need this change to stay interesting. To me, GW2 feels like the same game I started a year and a half ago. Compare this to GW1, where Cantha introduced new PvP content, 2 new professions, new weapons, and a bunch of new skills for all professions. It makes the game interesting as all these new changes fundamentally change the nature of the game.
GW2 needs new content that really changes up the gameplay, not just new trains to join to get the newest headgear/backpiece skin.
EDIT: Yes, I realize that technically Factions is a "Chapter", but it mirrors Expansions in other games.
For the sake of this discussion, an Expansion should be defined as Content that must be bought, but includes new areas (with multiple zones), new gameplay, new skills, and either a new race, profession, and/or a dramatic change to the existing game (such as new weapons for existing classes).
The advantage of getting all this content at once is that it all is in context: you can introduce a new race unique to the new area. New weapons and skills can also be based around this new area. It expands the game in a way the Living Story cannot, because of both the small team size and limited window of the Living Story releases.
Edited by Mordakai, 21 November 2013 - 01:51 PM.