I disagree that Android was not a viable choice for Nokia. What got Nokia into the quagmire they were stuck in was a relentless pursuit of perfection - not just in the hardware, but the UX of the device.
Focusing this way makes it very easy to become entrenched with the underlying OS - in Nokia's case this was Symbian. It is what you know, you can move faster with it. Before you know it, however, it becomes outdated and suddenly you are stuck.
I see some of this same pattern developing with iOS on iPhone. Android is really outpacing them currently. However, I believe having the tablet product line and the need to keep pace with the constant evolution in OSX will keep Apple from getting completely bogged down.
I hear great things about the Nokia windows phones. I loved my Nokia phones and will hold out hope that eventually they build an Android-based one. I'm aware that some folks have it running on their current phones, but like I said above - part of what I want to see is Nokia's UX influence - that's one thing that is still missing in Android.