I hope 'new Microsoft' continues to embrace open source and cross-platform - I'm very impressed and never would have imagined this direction a decade ago, either
They will, because ultimately their new OS for developers is Azure. They do push you towards that but it is actually a good cloud system. Microsoft has moved lock-in further up to the cloud (just like everyone else AWS, Google) and the tools are so nice once visual studio is truly cross platform (not just vs code -- though nice competition to sublime/atom/etc) then a tool lockin.
Personally, I think it's all thanks to Oracle. When Microsoft suddenly realised that they were no longer the most hated IT company in the world, the shock was too much for them, and they just stopped trying any more.
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Seriously, I have, right now, just dropped out of Vim into VSCode to debug a C program, because the VSCode debugger is fantastic. Everything just... works. In fact, I'd drop Vim in a heartbeat in favour of VSCode if only the vim keybindings were better, but right now they're pretty terrible and my fingers get confused. (Mercurial integration would be nice too, but mostly I use hg from the command line so I don't mind.)
They are going in the right direction but i feel like they still have a long way to go before people in the Linux/OSX world start taking C# seriously and we see actual products.
Especially with all the hype around containers, C# is left in the cold. The deployment story would have to be as good on Linux for many to even consider production services
I've been able to use several of the onbuild base images with C# projects.. given they weren't anything huge, but it's been pretty cool. Should only get better.