pps: I wish for an Emacs rewrite. As a scheme/lambdacalc enthusiast, I love pruning things out to a certain extent, and feel Emacs is too much a bazaar, and would love for it to fork a smaller core mammalian child. Something even more self-documenting [1] and with a stronger fp-ish flavour (when it's not absurd).
The goal, making it easier to learn and understand.
[1] a lot of knowledge about emacs is outside of it both in location (not in the manual) and form (videos, podcasts, static tutorials). This is influenced by the trend for interactive documents (B.Victor, Wolfram) and Notebook/Persistent repls (ipython,...).
ps: emacs should have 'didntknowthat...' as subtitle.