For Windows Phone (or whatever next year’s version will be called) it’s in how much control Nokia can wrestle from Microsoft. If Microsoft is in control, a definite no. Just look at Microsoft’s phone and tablet legacy.
Will Android, Windows Phone Be the Top Mobile OSes in 2015- – News & Opinion – PCMag.com
Not that such speculations matter much, as business is now for most companies. And by now I mean supporting primarily Android and iOS, optionally MIDP, Symbian, Windows Phone and Bada.