Also the Clojure language had a huge growth period around 1.1-1.5 which sparked a lot of excitement and spurred a lot of community growth. But since then, most of the exciting features have been adapted to other mainstream languages either as features or libraries, and most senior developers I know prefer to take the path of least resistance, which includes avoiding less-mainstream languages and frameworks. So instead of using Clojure with Compojure, it's common to move to Java with Dropwizard, or slightly less analogous, JavaScript with Express.js. And instead of using ClojureScript with Om, people mostly jumped to JavaScript + React.
Edit: Removed comment about Om, since I must be misremembering something. Om uses React and has since the first commit.
Edit: Removed comment about Om, since I must be misremembering something. Om uses React and has since the first commit.