Despite the fact that Pokémon Go has become the world’s biggest mobile game, it has already started its certain decline. This is despite the fact that the game is showing a greater ability to retain users than most mobile games.
Although it may be stating the obvious that all mobile games will eventually become less popular, it is the way in which this attrition of users happens which turns out to be absolutely constant. Craig Palli of Fiksu has shown that user retention decline in games follows a distinct pattern. The figure below is for 5 games, each with over 20 million downloads.
The pattern is identical to one colleagues at UWA and I found for users dropping out of doing massive open online courses (MOOCs). A feature of MOOC attrition is the extremely high attrition rate whose rate of decline was constant across different MOOCs with different initial enrolment sizes. Like free-to-play games, MOOCs cost nothing to enrol and have no consequences for leaving.