It doesn't surprise me that a large amount of people are leaving. Not because the game is particularly bad, but it is a bit of a unique experience. Advertising rarely focuses on explaining a game's mechanics so, enviably, there's going to be a disconnect between expectation and experience in a portion of the player base. It seemed like there was a gigantic advertising push (from two well-known companies) which would feasibly increase the percentage of people in this category by a fair margin. I also personally know a few people who are more into the social aspect of gaming in the "well, it's what all my friends are doing so I may as well check it out" sense. These people are also quick to jump off the bandwagon when they find something new that they enjoy more or enough of their friends move on. Overall it just makes sense to me that Destiny's population would drop to where it would be if there had been more information about the games mechanics and less advertising. I wouldn't be worried about the entire population of Destiny drying up despite that being where a graph would point right now.