They are posting on HN and lambda the ultimate so they can stay relevant.
Chez and SBCL (counting the open source ones) are doing fine, and have just better compilers. SBCL optimizations are trivial to improve, Chez not so.
All things considered, KIWIMOB.
Lisp is already at the pinnacle of evolution, and can easily morph into whatever it needs to. That's both its greatest strength, and its greatest weakness.
I have been writing Clojure full time since 2017. Most of my work is about building mobile/web apps and APIs.
Ferret Lang is a lisp that I dig. It compiles to C++11 and is crazy fast on low powered hardware. Coming from Clojure, Ferret feels nimble. But I don't think I'll ever have a use for it.