When can I call the story complete?

If I were a Blizzard employee, I would probably say 'When it's done'. If I were employed in the game industry, I would probably be bound by contracts, deadlines, etc. However, as a hobbyist working on a module in his spare time, where should I draw the line?

When I started writing the story for this module, I had a very clear objective in mind - the story should progress in a very organic manner and the character driving the story (you, the player) should never feel that the story is taking a backseat to some inane side-quest. Of course, there will be times when the story takes precedence over the player's actions - the bane of every RPG in the eyes of the hardcore role-player but that is a limitation of the process.

As the plot progressed and I started making the levels and writing dialogue, so many possibilities sprung to my mind - why is this character behaving like this? Should he have a back-story? Should I have a side-quest where the player uncovers the truth behind the NPC's actions? After spending a week revising the story, I realized - why would the character, undertaking a critical task that is of personal importance, take the time to learn about every person he meets? It just didn't seem logical; the flip side is, without a convincing backdrop against which the player-NPC interaction occurs, the experience can turn out to be shallow, to say the least.

Then, I had what can only be termed as a serendipitous moment - in my attempt to provide many of the NPCs a background, distinct patterns had emerged. Taking that a step further, I revised the story again to introduce multiple factions into the story - each with their own objectives - and while they might collide with the player's story at some point, the ends are distinct.

...and then came DA2 and a brief PM chat with David Gaider.
After the initial DA2 announcement, I hadn't been following that too closely. I needed some clarifications on certain things I was including in the module and wanted to make sure it would fit in with the lore so I pinged David. Between the PMs and the initial promos for DA2, I realized some of the story I was including would vary from minor interpretational differences to portraying a completely different world. That resulted in the final revision which I have decided I won't change, come what may.

That defiant stance is primarily because most of the areas where I have applied my creative license to the lore would likely be delivered in a sequel to the current module - more on this later (it's all in a flux in my mind right now)