[throwaway12309]

Yes, because Clojure and Go used soooooo much more than F#, Scala and Lua (among others).

Rails was nice when it came out, other languages/frameworks caught up. NodeJS non-blocking IO was nice when it came out, other languages/frameworks caught up. Now that you have those 'features' in other languages (Play for JVM and ASP MVC on .net to name two), some folks gone back to those platforms while others stayed in Rails/NodeJS. Only the freaking hipsters - look at me I have a blog - developers are switching platforms every 2 years for the next shiny thing.

(and I know there were other languages/frameworks that did similar as Rails/NodeJS but just never caught up)