>What about the interactive environment like the one in Common Lisp?
Never used a "real" Lisp REPL, but Conjure[0] seems like it ticks a lot of boxes.
>Is this one going to remain obscure?
There are only a ~dozen mainstream languages. Once you get outside of the popular zeitgeist, you have to appreciate exactly what you are getting. It takes a lot of dedication to become fluent in a language/ecosystem, so it is no surprise that people are reluctant to switch to a novel platform. Clojure is far more likely to ever become mainstream (owing to the huge JVM ecosystem), but even that seems to have only limited industry penetration.