The web is very generational. One day such and such is the greatest thing. Then the next day another thing is the new hottness.
Static site generators are becoming very popular for a very good reason. Most sites simply don't NEED all of the crud that comes with dynamic sites. I think we'll be seeing a bit of a minimalization of a lot of websites now that static site generators are becoming more popular. This isn't a bad thing, it's almost like a reboot in a sense.
We'll likely see a large category of ways to combat the comment issue the link is discussing. But that's just one of the things that's so wrong about the article. The writer is worried about... comments?
Fact is Disqus provides a great service for people and it just so happens it works great with static sites. I know in the nanoc irc channel there was minor discussion about finding a way to use nanoc + something like couchdb to regenerate pages with new comments.
Point being, there are ways around using services like Disqus. They won't be going away and new services will pop up. The benefit here is that there's going to be a lot of changes because of static site generators. That's a good thing, it will hopefully make a lot of website generation tools a lot better.
The article however is kind of lacking any deep thought and relevent reasoning.