I have noticed over the years that interest in programming languages comes in waves. In the 80s and early 90s, when object-oriented programming was "hot", it inspired many new languages and interest in language design ideas. That ended when attention shifted to the new WWW. The 2010's were a similar "high-water" mark for functional programming and the languages it inspired. Now everyone is focused on AI, of course. Andrew Oram is writing a retrospective series about FP, then and now. https://www.lpi.org/blog/2026/03/18/functional-languages-and-the-future-of-programming-part-1/