Exactly. The next Facebook news feed will just fill the void, and people who blindly believe what they are exposed to will be in the same situation. Killing Facebook news feed is trying to treat the symptom while completely ignoring the disease.
Could AI fix this for us? Maybe. AI isn't entirely free of the bias of its creators tho. As far as solutions to magnifying gossip and fake news, I don't really have an answer. Perhaps you are on the right track.