Totally a link bait title. Clojure hasn't been around that long and therefore hasn't been in demand that long.
Heading off in any one particular direction based upon the way things appear to be now vs. what they will be long term wouldn't be what I would do. Do you think "clojure" is like "plastics". I don't think it is.
Also, as has happened with many career/skill (nursing at some point, law now) once the word gets out that something is in demand (because of supply and demand in balance) that changes as people are drawn by the chance to make money.
And clojure is a skill it's not a profession. That skill can quickly be replace by the next new thing.