Emacs is fine. Emacs-lisp is good enough for what it was made for. Every few years someone gets a "brilliant" idea that it should be something else but that gets nowhere. Languages cannot exist in a vacuum. If there's a proposal to make it compatible say with Racket, then you'd have to create a strange hybrid of Elisp-Racket because you can't just make all the existing Emacs packages incompatible.