I want to say Microsoft will not killing Windows Phone. There are some things. 1) Universal app. That makes for developers more interested and easier to build just app what works on more devices. 2) Continuum feature - this is one of things what will could change phone hardware. What I mean, I believe Microsoft will release phone with non-ARM CPU. This will give chance to run and use more apps for business etc. 3) If Microsoft kill own system than potential domination is left for Android and iOS. I dunno how many Microsoft can lost on new patents etc.