I'm not worried about the 'old news' problem he talks about, I'm more worried about the combination of groupthink and algorithms that learn what I read and serve me the same stuff. One of the joys of newspaper reading is that there's a lot of stuff in them that I don't want to read (at first), but over time I get trained to look at topics I wasn't interested in.

When recommenders are applied to news you'll get more of the stuff you like, but you're losing out because you are not seeing the stuff you didn't know that you would like.