Adoption (especially in industry) takes time, but there's definitely interest in the Clojure and Scala communities.
The CHAMP data structure was already picked up by the ClojureScript community (https://github.com/bendyworks/lean-map), but still requires some work to be upstreamed to Clojure I guess.
I personally (I'm the author of the thesis linked above) plan to work together with the Scala folks at Lightbend for the collections overhaul that's planned for Scala 2.13 (see https://github.com/scala/collection-strawman).
Any idea about CHAMP and Haskell? IIRC the reception of HAMT was somewhat lukewarm back in the day, and AFAIK to this day the Haskell standard library doesn't use them.
The CHAMP data structure was already picked up by the ClojureScript community (https://github.com/bendyworks/lean-map), but still requires some work to be upstreamed to Clojure I guess.
I personally (I'm the author of the thesis linked above) plan to work together with the Scala folks at Lightbend for the collections overhaul that's planned for Scala 2.13 (see https://github.com/scala/collection-strawman).