I'm not sure that'll happen, because Emacs itself is not so much end-user software as it is a platform/VM for developing and running Elisp code.

There are many great applications and compatibility layers written to run on Emacs:

- Evil for a decent editor,

- calc for a good, flexible calculator,

- magit for version control,

- smerge for conflict resolution,

- dired, org, notmuch, tramp, eshell, outshine, comint, htmlize, etc.

and each of them deserves a "the good parts" book!