They have tried 3 times already & bombed each time worse than the last. The biggest one time supporter - Samsung I believe it was - has announced they have bailed & joined the Android camp and have enjoyed a surge ever since. It is now down to Android vs iPhone (IOS) with no one else likely to break in significantly in the next 4-5 years. Microsoft is not good at anything that needs to have a small & reliable footprint. People don't want or need pc power phones and thats what it takes to run an MS operating system. Ask Ford owners how SYNC has worked out for them if you need other examples of unreliable/unmanageable MS attempts at "simple" interfaces (Hey, this issue goes back to BOB!)
Palm /HP had the best OS for phones in the WebOS but it too has now been regulated to a niche at best. RIM is still #3 and they are barely holding on. WebOS - now that it's public domain - may have a brighter future as an upgraded interface to Android than any version of Windows phone. If you like the Windows phone thats great but it isn't a serious player, doesn't have much application support and is a likely dead end technology long before the hardware life /contract is over. Recommending it to a new user is not a good idea IMO.
I'm not a believer that the market picks the best - it has been proven time & time again it doesn't - but manufacturers and developers do not continue support very long for any product with a tiny market share. That is Windows phone to a fault.
With all due respect, you make some pretty gross generalizations. Samsung has not dropped WP. In fact, here's an article on new WP phones being introduced at CES by the 3 largest phone makers in the world:
http://www.windowslifestyle.com/htc-samsung-nokia-unveil-windows-phone-ces-2012/
I'm OS indifferent, but as I said, Microsoft's new phone OS has been well recieved by both the general public and the tech media. If I were shopping for a new phone, I certainly would at least go play with a WP device.