It's hard to say there isn't a downwards trend at this point: https://trends.google.com/trends/explore?cat=31&date=today%205-y&q=scala,groovy,kotlin https://tr

It's hard to say there isn't a downwards trend at this point: https://trends.google.com/trends/explore?cat=31&date=today%205-y&q=scala,groovy,kotlin https://trends.google.com/trends/explore?cat=31&date=today%2... Kotlin and Groovy both look pretty stable - both having core uses in their domains that I am guessing support continued traction as "the best tool for what they do". Scala I think peaked when it had the overlap b/w business use and data science. I feel like Kotlin / Scala / Java are all after the same essential core market - a solid, type safe language to shoulder the huge broad need of enterprises to keep business software pumping away reliably. So they are essentially all part of the ebb and flow of the one giant "JVM" ecosystem. Groovy sits a little outside of that since it specifically targets a different type of problem (providing an optimally integrated JVM scripting language for DSLs and rapid application development).