I'd like to see if it would be easy to support ReST beside markdown. I'd like to reuse my current files instead of trying to convert them haphazardly...
As morantron says in https://news.ycombinator.com/item?id=13158062
you can navigate from within your existing markupdown* files in Vim by putting the cursor on the filename in your .md/.rst file, type gf, and Vim opens the target file.
I wanted to be able to use the links that I was going to write anyway in my .rst files, but they end in .html and when in vim you probably want to go to a .rst source file.
So you write them ending in .rst, and the makefile fixes that up before giving the file to rst2html. Proper nav within Vim and on the generated .html page.
Would work equally well with any capable programmer's editor that allows you to "go to the file under the cursor."