That can definitely be done today: just point a link to a public matrix room...well, the participants would need an account associated to a homeserver first in

That can definitely be done today: just point a link to a public matrix room...well, the participants would need an account associated to a homeserver first in order to interact...but that's no different - conceptually - than needing to have a disqus account. The benefit of course is that their account can be associated to their __own__ homeserver! In fact, i do this already on my website; though for general contact (like a poorman's contact form), rather than a comment section for blog posts - but the approach works for either perspective.