On one hand, you're right, the game is one of the most developed games around. If the game was abandoned now, years of work would be wasted.
On the other hand, there's still one crucial thing which is missing from the game: any kind of an ending, or a goal. All that corruption doesn't seem to have an ultimate goal, and once all the town girls are pregnant, producing kids every month, and permanently in deep trance, there's no point in playing any further. And with no endings, no final goal or score, or whatever, I won't call the game complete.