I would like to read a convincing account of how M$ would extend and extinguish the Linux kernel (or GNU userland for that matter). All I can imagine they care about is a) making sure Azure succeeds and b) getting users on monthly subscriptions for everything.
It's not that I don't believe the latter 2 of the 3 E's aren't plausible, I just haven't read a convincing account of what they could feasibly be and why M$ would have that incentive beyond spite. Satya Nadella seems like a paragon of neo-liberalism (everybody should be nice and get along, just let us maximise profits).