IMHO, Microsoft won't merge considering that:
What I actually see is that Microsoft is giving lots of code in open source project so Microsoft technology persist. I think about their involvement in Samba so it can talk to Active Directory.
So what I think will happen is that Microsoft will be a "friend" to the other OSes (Linux, BSD) and facilitate the lives of people but Windows will be the only mainstream closed source OS (for those who don't know, MacOS kernel is open source github.com/apple/darwin-xnu/).
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