I honestly don't think there much wrong or a problem with F#

I do follow F# somehow, and compared to other languages .. it actually seem to have a very pragmatic and active community

The F# community build a lot of interesting frameworks, suave, websharper, type providers ... to name a few

I dont think, anything will look popular, when compared to Java , C# or Python .. but compare it to Haskell, Ocaml, Clojure.. Dart, D, Nim .. and the plethora of languages that compile to javascript , and you will see F# is not doing so bad