The media is already decentralized; there are many news sources and they often do not entirely agree with each other. People understandably are keen to prioritise the accounts of outlets they believe to be generally reliable over those they don't. Those considered most reliable fulfil the informal role of "arbiter of truth" for their audiences.

I don't think further decentralizing so each individual has to carry out original research with primary sources to obtain any sort of picture of what happened in the world yesterday would represent a feasible improvement, and I suspect the conclusions people would draw instead of doing that research would be [even] worse.