It was inevitable. You have to think about the audience using Pokémon Go or other social media apps/games. I've never used it and won't ever use the app but I am, sadly to say, part of that "target" audience all of these fad apps go after; millennials. Millennials have the attention span of a moth. An app, a product, a service hits the market and everyone needs to be a part of it. But it doesn't last long. It loses its novelty so fast and so violently that 3 months down the line, it's nearly obsolete. Millennials have this insatiable desire to connect through technology, not through face-to-face, honest human interaction. With that being said, we'll see a bunch more similar apps/games being created especially with the rise in virtual reality. Pokémon Go will be dead as soon as the next app is born that diverts attention to it with great influence. Being a millennial, I've experienced this first hand. Slowly but surely, at least in my area, Facebook is becoming known as the "old" or obsolete version of social media and connecting online for millennials. I think more of my friend's parents are on Facebook than my actual friends are. Snapchat may last a bit longer than most other social media apps considering it feeds into our inability to concentrate for more than 30 seconds at a time by showing us 30 second videos of peers.
Just as a side note; I'm pretty off the grid for a millennial (21 yo.) No Facebook, Instagram, Snapchat. I'm convinced these apps destroy individualism or what we know as individualism at its core. And I can tell you one thing from staying relatively off the grid in terms of social media; I've never been more happy.
Side Note #2: If you're interested in the subject of social media and the changes seen in millennials in terms of personality and individualism, read Reclaiming Conversation by Sherry Turkle.