I was never an active Pokemon Go player, but few of my friends were really into the game. Every Friday we would go out for a walk, in near by park and they will have their phone out and be catching Pokemons. I guess it was just how much more I can catch thing. They always wanted to get the rares ones. Who doesn't right? Last 2 weekends I have noticed 2 of my friends didn't care much. And, slowly, the interest faded away. Now we all going for paint ball.
I don't know if it's Ninatic not coming up with good updates or its just a common thing with every mobile game. Angry birds, Candy crush and now Pokemon Go?