To offer one small piece of anecdote to the contrary: We use Clojure for most of our server-side code and picked Lacinia from Walmart Labs [0] to implement our new GraphQL API. It does most of the basics just fine, but its pace of development lags extremely, painfully far behind GraphQL server implementations in more popular languages such as the ones in Node and Python. To this day it still doesn't have support for custom directives [1], not to mention any of the other more bleeding edge developments in the GraphQL community such as schema stitching and live queries, all of which we would really have liked to experiment with along with the rest of the GraphQL community. We ran into similar issues initially when trying to use gRPC with Clojure.
We love writing Clojure and still use it everywhere where appropriate, but the size of its community and ecosystem is definitely holding back its ability to compete for adoption with other languages on the bleeding edge of new technological trends.