I have really apprehensive and mixed feelings about this... on the one hand part of me feels that it's about time, and maybe the right time to bring Xamarin's tooling into the fold... their cross platform tooling for VS has been great, and .Net via mono has seen some integration of MS's new .Net core codebase where appropriate.

The paranoid in me acknowledges that outside of MS Office, they've pretty much never kept a non-windows client project alive for more than two major releases. I wouldn't mind seeing the VS Code codebase become closer to what VS proper could have been, and seeing more cross platform support in that regard. I do like what they've been working on in Azure services and integration, just hoping the teams don't come in just to die in a year or two (Managed JScript, IronRuby, IronPython for starters).

I'm honestly hoping for the best, but that hope is definitely tempered.