An extremely late response, I'm sorry, but: I think you are asking the
wrong question here.  Instead of asking "would people be interested in the
protocol", ask "would people be interested in *what can be done because
Emacs supports* the protocol".

Beyond that, it might be a fun hack to add, but brings no real value; the
benefits come from the capabilities it brings.

(I also agree with 2017 RMS on the correct location for it.)

On Tue, Dec 18, 2018 at 7:07 PM Eric Lindblad <lindblad@gmx.com> wrote:

> Do you think GNU Emacs users would be interested in using 9P protocol from
> within the editor, implying an Emacs Lisp 9P Client/Server might be
> authored?
>
> http://9p.cat-v.org/implementations
>
> The 9p.scm (client) hyperlink in the above URL is dead, and it has a new
> home at the below URL.
>
> http://nurmi-labs.blogspot.com/p/9p-scheme.html
>
> Maybe other GNU Emacs users have another opinion to that of R. Stallman's
> (circa 2017) response which is reproduced below.
>
> "It makes no sense to put this feature into Emacs, which is the wrong
> place for it.  The right place for it is in the kernel (Linux or the Hurd),
> so that all the application programs will be able to use it."
>