A Change.org petition requesting that Niantic release a version of Pokémon GO for Windows 10 has reached 50,000 signatures. The petition was made over 10 months ago, clearly before anyone could have known of the popularity of the game.
In fact, the mobile app is so popular that the New South Wales courts posted to its Facebook page that gamers should not be looking for Pokémon while at court. Early on, there were also security risks when signing in with a Google account, but that has since been patched.
The petition itself doesn't seem to have been updated in a long time. It contains links to articles about how Windows 10 is now installed on 81 million devices, and that Windows Phone 8 is the third most used mobile OS, but second in "numerous markets". Of course, Microsoft announced two weeks ago that Windows 10 is now on 350 million devices, and Windows Phone 8 isn't second in any markets.
The Change.org petition now calls for 75,000 signatures with over 23,000 remaining. It's not clear if Niantic will respond to this, but judging by the Windows phone sales figures, it's probably not likely.
Of course, Microsoft has its own augmented reality ambitions. If Niantic ever decided to develop a Pokémon GO app for HoloLens, it could always come through as a true Universal Windows app, which would be available for phones as well.