One of the biggest shifts that has hurt the visibility of forums these days is not in everything becoming gamified with internet points, or "robotized" with preference-oriented content.
IMO it's actually our societal inability to pay attention to one topic for more than a few minutes at a time. We've become so well trained by the constant drip feed of randomized content, and the chase-the-rabbit research methodology of wikipedia, that when you encounter a forum in your search results, you probably didn't even consciously realize it because you skimmed it for the content you were looking for and moved on.