I like it, but who gets to decide which sources are trusted?
More challenging than earning that initial trust, is maintaining it, not allowing a perversion to occur over time (where the service becomes biased, irrational). For every service that gains initial trust, most inevitably lose it over time; keeping it long-term is far harder.
[I just imagine a finance guy after Heartbleed or Stuxnet complaining "woe betide me, the IT coverage on CNN and Foxnews is so bad... I wish there were trusted channels to discuss these, you know, hacker news!"...]
Yes, a meta system that would have the best channels available per topic (HN, Money Stuff, The Aviation Herald/PPRUNE, etc.) would be great, but I imagine it would pretty soon be exploited and overrun... Maybe it has advantages that they are generally somewhat out of the limelight?