I'll certainly agree with you on that. Here's how I understand the whole delay.... given a coder and a writer of equal skill, writing code is much easier than writing story. You know what needs to happen and you have a relatively good base idea on how it can happen. While some things need reworking every now and then, it's pretty much a straight path. A story is much more complicated as it requires a lot more imagination. I can understand that, but... I haven't seen a whole lot of story content being added to the game, which makes me think that either they fired all their writers once the game was out (Overall, a pretty bad idea, considering it being a story-driven game) or they have one too many things said writers are working on rather than focusing on single projects to get them out of the way.
Players will always want more, so prioritizing tasks for the writers in an attempt to get content out in a timely fashion should really be done, because honestly, I don't see why there would be a hold-up otherwise.
Disclaimer: I know there's a whole lot of ifs and maybes in this post. It is pretty much me letting my train of thought go. Practically nothing in this post is and can be substantiated by evidence I am able to provide.
As far as I know, most of the writers are still on-board. A couple have left to pursue other things, including the Agent story author. That's a big loss, actually. IMO, the Agent story is the best in the game.