Hello. We often see discussions about expansions, or rather the lack of them, on the forums. I believe these discussions fail to realize the one major downside to expansions, which I personally believe to be the reason none are planned currently.
Its not the amount of content. Its not the content types.
Its the fact that expansions split the playerbase. In an MMO this is a serious issue.
While some players are fanatics like me that would buy every expansion no matter the price, a regular player sees an expansion and thinks not only "Is this a good buy" but also "Are my friends going to buy this too? Who am I going to play this with if they do not?"
Making playable content universal and only monetizing out-of-play elements like the cosmetics, eliminates the problem and still lets Anet monetize most elements that would go into an expansion, like the armor skins and so on.
Another thing Id like to point out is that unless ulyou believe the team is slacking off on the job, the total amount of content produced should be constant - the terrain artists are going to put out the same amount of new maps per day, the animators are going to put out the same number of new moves, ni matter how the content is packaged.
Thank yoi for reading! Have fun in the game!