While I am happy to hear that Windows Phone is easy to develop for I don't see myself doing any development for it. I attended the GDC recently and there was a lot of buzz around tablets and phones as games platforms. Microsoft had a big presence there with the XBox but I didn't see anything about the Windows Phone platform. A missed opportunity in my mind. I need a reason to consider experimenting with Windows Phone. Put a nice phone in my hand, show me why it will be a great device to develop for and there is a good chance that as I look at prototyping some apps for phones and tablets I'll take a look at the platform.
So far I only know one person with a Windows Phone and that was given to him by a relative at Microsoft.
Making it easy to develop for is one thing, making it easy to get a device and giving me a reason to work on one is something else. At this point I think MS needs people like me to consider ensuring that apps work on their device more than I need to make sure that what I plan to work on works on the platform.
That said, tablets based on WOA are very interesting. I wouldn't buy one but can't wait to play with one.