I'm hoping for a Common Lisp emacs, myself. Scheme as specified just isn't a big enough language, and if you pick one of the better implementations (e.g. Racket, which is awesome), then it's not really Scheme anymore (e.g. Racket, which is really its own language by now).
Also add to this the trend or rise language servers .. emacs can continue to be used as a solid ide alternatives
And .. guile emacs hopefully one day
Any work to improve and re-use emacs is good for everyone