I guess we have the OP's article as something available in public media. The infographics are useful for giving a basic idea of how many media companies are under each corporate umbrella. There needs to be more of an understanding about why trusts and near monopolies like these are going to just get worse as they continue to merge to compete against each other's super Chimera. The fact that these companies own intellectual properties that the public wants to consume may make them more willing to turn a blind eye though. There would need to be an event that causes significant anger in the public to inspire outcry. Not just knowledge.
That would help but there seems to be no incentive to push anti-trust efforts. Otherwise these mega corporations wouldn't exist in their current behemoth forms. I think public outcry would need to be strong enough to pressure antitrust action, but people tend to be fine with it since less companies makes access to their media more simple and streamlined