I think really most sites should (ideally) come with a text-only version. I know that's probably an extreme minority opinion but between console-based browsers, screenreaders, people with crappy devices, people with miniature devices, at the very least just having some kind of 'about this site' document would be helpful for anyone. There seems to be overlap between that need and this, possibly.
Then again, having it in some format like json (or xml) might also be more 'accessible' to machines (and to certain devices).