With Android, Microsoft is dead. Or at least fast-tracked to total irrelevance. Microsoft termed themselves a Services and Devices company after their reorganization last year. While it is important for them to have people using their services, which could be done as easily on Android or Iphone as much as Windows Phone, Windows Phone is an extension of Windows, which is still one of their core businesses.
The next step with the upcoming major releases to Windows and Windows Phone is to further combine the two. Windows 9 running on a tablet may be the exact same operating system as Windows Phone 9, which is the long way around to Microsoft doing what Android and IOS already did, but nevertheless, that is their goal. With that, developers using Microsoft's SDK will be able to write single apps that work with Windows desktops, laptops and tablets and Windows Phone devices. If Microsoft would give up and build Android, then they would eliminate any reason for developers to write native Windows apps. So Windows would dwindle faster than ever.
After that, I fail to see how MS-Droid would ever gain any traction in the marketplace? Sony, Samsung, HTC, etc are already building Android phones using Google services. What would compel them to build a version of Android that is almost what they've using for years, but uses entirely different backend services to Microsoft instead of Google's. All of that would be happening at a time, by the way, where Google's slowly decreasing the openness of Android, as more apps use Google specific APIs to be Play Store certified. So even Android isn't necessarily Android.
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