Right now one of my side projects involves F# on Mono.

I write in Visual Studio, which I own, I deploy to Mono, which is free, and I have access to all the MS libraries over in linux, which are also free.

What's there to support? Do I really need version 7.0 of F# with the neuro-cranial implants? Or do I need just to write solutions for people?

F# is a great transition language from OOP/Imperative-land. You can write code the old way, the new way, purely functional, or in a hybrid fashion. I don't think we require much MS support for it to continue to fulfill that role.

Now if you're deploying to windows, that could be another kettle of fish. But I don't do that anymore.

As an F# MVP, I can tell you MS is committed to the primary functional language on the .NET stack, but more importantly MS has open-sourced F# https://github.com/fsharp/fsharp. The membership of the FSharp Software Foundation http://fsharp.org/ is very active and growing under the informal leadership of Don Syme. F# works today across Linux, iOS, and Android with a community of OSS programmers improving x-platform interop almost on a daily basis.

Thankfully the compiler is open source and there's a thriving community outside of Microsoft (see http://fsharp.org), so this shouldn't be a big worry. And Microsoft hasn't shown a lack of commitment thus far (in fact, with the Visual Studio 2013 release F# gets new features but C# doesn't, as I recall).