Microsoft had to fix the C# compiler. The result was Roslyn. It's actually amazing that Roslyn was a successful project. Probably most software projects that ambitious fail. The project would have failed if they tried to make it F# compliant at the same time.

Speaking as someone who makes his living writing F# code, I'm as frustrated as anyone about this, but there will be a successful resolution. I just don't know how soon. Before today's announcements my personal thinking was that it would be this autumn. That's still possible. In the meantime I can still function in the F# world, as before. It just remains frustrating to branch out into some of the areas I would like to.