If you want one huge example where we are embracing Linux as an OS, just see how our SQL Server team is bringing SQL Server to Linux. (its not in public preview yet but we're working on that). https://www.microsoft.com/en-us/cloud-platform/sql-server-on...
But don't get me wrong, we really love and believe in .NET and our own server technology, we're always looking to find ways to innovate and grow it. Just as one example, look at all the work we've done with .NET Core and bringing that to run on Linux, Mac and Windows equally. https://www.microsoft.com/net/core
This isn't the old Microsoft and I love working here more and more every day now that for the last few years we've really embraced the developer community to enable them choice in however they want to build their next app.
Eh, developers (collectively -- individually, less so, but the set of individuals that make up the collective are in constant flux) are fickle. If there's something good on offer, they'll come back. There's some psuchological resistance that might make rebranding helpful to this, but Microsoft's big enough that, they can probably afford keep things going long enough that people will get over psychological resistance even without that, if they are dedicated.
The last four years I only developed UNIX applications outside work.
Its just a false sense of security, in my opinion. Python and Django has great documentation that most of all is relevant with good examples. For the things that you cant figure out, you can always read the source and you will find the answer.
Too late. Developers have left the building.
.NET only exists any more because of legacy interests, there's little compelling developer story otherwise.