I think this is probably the best thread to continue this discussion, apologies if not.
@sam, in this thread, you mentioned this idea:
I like this idea, and think it could work well in my community (we’re considering moving our wiki from mediawiki into discourse). Is it something that would be considered as a PR to core, or should I be thinking about a plugin?
Alternatively, is there now a better solution for allowing people to “watch/track” a wiki post for changes?