VanaBout failed because of their own decisions:
Create content that caters to soloing in an instanced event with limited slots, then be surprised that people complained about congestion.
The personal rewards for the event were either useless or an insult to the time:reward ratio for other attainment methods. Notable exception to the 100 Deeds reward.
The group reward was rather weak and a huge wildcard depending what the monthly campaign bonuses were.
Moreover, the Ambu bonus was tied to yet ANOTHER daily, as if there arent enough dailies as is.