I think what's important is that we look at the situation in context. BB has had a large drop in users, but from what I can tell, other manager games have experienced similar losses. One manager in this thread mentioned Charazay dropping from 22k users to 9k now. According to Hattrick's Wikipedia page, it currently has 300k users, down from a peak of 1 million. 
When we talk about BB's user loss, we usually assume that it's due to problems with the game or with the way the business is run (ie advertising). However, maybe the biggest reason is that there simply isn't the same interest in the online manager game genre that there was a few years ago.
Last edited by Mountaineer at 4/2/2016 4:15:37 PM