You are right, but do you think it's coincidence that Bungie will "finish" the DLC for December? And that their PR spin is currently about the millions of people playing Destiny? They know they will lose players, but everything is timed to recoup lost players with new ones. Its all about maximizing sales at key intervals (They won't replace all the lost players, but it's fine as long as they hook people, even at increasingly smaller groups)