This is sad for me because Jet used F# extensively - one of the few non-finance companies to do so.
If I'm going to invest in spending the time to really learn a programming language I want to know that there's a community that's doing reasonably well to promote it. Microsoft has done a terrible job - treating F# as a 2nd class citizen for a very long time. Microsoft has all its eggs in the C# basket with respect to .NET. Without Microsoft support F# will continue to be a tiny niche - sadly.
It's a terrific product with little corporate backing. C# gets more F# like everyday. I have limited time to invest in learning technology (especially the way front-end tech changes so quickly) that it's hard to justify committing to becoming proficient in F#.