What if a browser was built like Emacs is built? With low-level rendering core exposing almost everything to scripting in Lisp, and the entire UX written in Lisp, fully customizable? It appears that Next goes in this direction. I don't know if gtk-webkit allows to script it very deeply, e.g. enough to expose DOM and write extensions in Lisp. It would also be great to have something like the Emacs's customization fram…
Mostly because I'm selfish and want more of Org Mode's features supported in more places, but also I'm super impressed by Emacs' scripting/control abilities.
I'd also like to see vim with a mode specifically for Org Mode. But that sort of idea is very much beyond my talents :/