That sounds like a mighty good idea to me. Not a fan of the Acme interface, but the idea of exposing the editor API through the filesystem means that there is no war like Emacs Lisp vs Scheme in the Emacs world (an no people suggesting that we should switch to JavaScript): people will write plugins in any language they damn please, and they can even follow trends (Go this year, Rust next year, and OCaml from 2017 forth).