I feel that a lot of this is a 
rich people’s problem.
For my modest and not so popular blog, if anything, I want to reduce barriers not raise them, I do not have a comment problem.
If we are going down this path we would need to build a component into the “embedded js” that also tracks read time on the OP article. (which would help to a degree - but keep in mind stuff like twitter app will default to reader mode so you get no tracking)