I think that speaks more towards engineers that like shiny new things that do something in particular in a new way which then help drum up excitement and an ecosystem around it.
C# is a very good language, but there's nothing new or shiny about it now. The tools and ecosystem around it are well established and managed by Microsoft and often involve spending some money.
The excitement for new things like Go, Rust or Julia etc are really not a signal for new support for C#. I think if anything Microsoft should continue their new support for llvm[0]. Windows is a fine operating system, I'd like to use it to do development and the closer I can get to developing things that then run on linux the easier my life will get and the more likely it will be that devs use Windows.
[0] https://blogs.msdn.microsoft.com/vcblog/2015/12/04/clang-wit...