[remix2000]

If you made all keywords fit one character or so and allow selective installation of dictionaries, that would probably also decrease source code form size significantly! That would be great even if you never were to use any language other than English. I’ve played with APL a bit and found out that one can configure Emacs to replace APL’s cryptic symbols with English words using this: https://www.emacswiki.org/emacs/PrettySymbol

APL is however not a language that one would consider using seriously.

[lordgrenville]

Emacs also has prettify-symbols-mode, which by default replaces lambda with λ, but can do a lot more - it can make Python look like this! http://www.modernemacs.com/img/spacemacs/python-code.png

[JohnBooty]

     that would probably also decrease source code form size significantly! 

I feel like, out of all the challenges facing software development today, "source code size" is probably not in the top 10,000 =)