First, the game is much too simplistic and repetitive and requires the same strategies to play the game. The challenge is just not real enough for sustained commitment to the simulated altered reality.
Second, the game depends on a solid GPS signal and internet connection as the player travels about. Then it needs the cell phone camera in the augmented reality chase. But, the battery has limitations and many phones just die in the process. To combat this problem, after-market battery packs are being sold to extend the shelf life of the power source.
Third, there is the data usage that is being used to chase the elusive critters. That is fine if you are in a free WiFi location but most players go far afield like cemeteries, abandoned buildings, other peoples property, and other unsavory locations. So, data usage can begin exceed your limit and cost a lot to play a basically mundane game.
I have not even mentioned the distraction of people walking into traffic, congesting meeting locations, pedophiles, and criminals. Maybe these are small components but never the less need to be considered. Having said all of this, there will be players who will become addicted to another waste of time and drain on individual creativity. Perhaps it is better to be walking than sitting in front of a TV or social media screen but in either event, Pokemon Go will be gone. FAD! For A Day!