You seriously think history books will show how Google and Apple won eternal market domination because of Pokémon Go? Even if it wasn't just another passing craze (and I have every reason to believe it is), one thing you can learn from history is that you can never tell what will change it's course.
EDIT: I stand corrected due to having misunderstood that the claim refers specifically to the status of Windows Phone.
They didn't win because of Pokémon Go, but the lack of Pokémon Go on Windows Phone will certainly be cited as evidence that Windows Phone had lost its relevance by mid 2016
EDIT: I stand corrected due to having misunderstood that the claim refers specifically to the status of Windows Phone.