In fact I wouldn't be at all surprised if Microsoft finally kills windows phone.
In the future? Perhaps if the situation doesn't improve. Right now? Very doubtful... they just recently made a huge investment on making Windows 10 run on Windows Phone and the Universal Windows Platform capable of running the same binaries (with responsive UI) on all devices from phone to IoT to tablet to Xbox to PC to HoloLens and whatever else they dream up.
Also consider that in most markets, Windows Phone is closer in phone marketshare to iOS than iOS is to Android. That's not saying a lot. But WP is definitely at the #3 spot, and the way this market is... if they can find that itch to scratch, things could change within the course of two or three years.