Elop ended Symbian, restricted Meego to small markets and made Nokia into a Microsoft Partner. The results were so devastating that it looked like Microsoft would not buy Nokia and Elop would not get his $25million bonus (with his specially reduced tax rate). I thought Nokia's Android phones were released to hit Microsoft on the head with until they bought Nokia. If Microsoft wanted to end the X family, Elop would have released another 'Burning Platforms' memo as it worked so fast the last time.
Microsoft Android remains in existence for a reason. My guess is that Microsoft know the carriers will not tolerate Windows Phone being successful on their networks. The carriers understand that being locked into Microsoft technology leads to becoming a Microsoft Partner (then it's bend over and trouser down while Microsoft empties your pockets).
Personal computers are now called smartphones, so to stay in the computer business, Microsoft needs a presence on smartphones. That is why we have Office for iPhone and Nokia X (Android without Google Play). Microsoft started Linux distribution when Novell became a Microsoft Partner (where are Novell's trousers now?). All that remains is Linux on Azure.
Microsoft Linux is here to stay - the OS for those who cannot afford the ever-rising Windows lock-in costs. The most obvious threat to the Nokia X family is a re-release the N9.