Pokemon Go, a surveillance and public health app developed by Niantic, is already seeing declining usage according to every possible metric (archived). Likely contributing factors include the game having been released broken with updates only introducing software that's even more broken and gameplay that's even less sophisticated than Cookie Clicker, Farmville, and supposed "games" played for fun. Combine that with the reality of rampant transmayoism keeping the most likely core fanbase from engaging in the optimal gameplay strategy of walking around outside and you have a complete market failure no amount of brand related nostalgia1 can save. Meanwhile other games with allegedly more satisfying mechanics are continuing to grow. Just say Pokemon No.
In related news Crystal Pepsi is back and 1990's nostalgia is apparently a thing marketers are trying to push. ↩