> Compared to Haskell and Clojure, which are soaring to put it mildly.

Soaring comparatively.

I am a big fan of OCaml, but I think one thing this infographic is heavily biased by is ease of adoption for programmers of all levels. Javascript, Python and others in the top all have that. OCaml and the like are all a bit steep on that front.

However if you find OCaml in the tiny graph on the bottom you'll see that it's steadily increasing at least. Up about 50% in active repos from 2013 to 2014.