It’s beyond antitrust, because several industries are organized into oligopolies. The dozen media companies effectively monopolize as a group, and they not only have vertical but horizontal corporate organization, as they have bought up any unrelated media as well.
So the same companies control TV, movies, radio, book and magazine publishing, music and content production, large venue promotion and ticketing, and broad sectors of the Internet.
Fragmenting this is not easy, nor should be done too rapidly, but needs to be both methodical and thorough. Companies split apart should not share in stockholders, directors or proxies, resources and capital, nor can they be permitted to conspire exclusivity with each other in the marketplace, or other restraints on labor or trade.
In addition, the function of corporate boards as watchdogs is largely a joke-- I got a proxy ballot for Chase's board a while ago and appeared that Dimon was putting some college buddies, etc., on the board.
Corporate boards also function as effective bribes for politicians-- How many former politicians get board memberships that are basically $200K/year sinecures from the former people they were supposedly helping to regulate?
Same goes for Federal judges-- How many judges "retire" into partnerships with the firms who brought cases before them?
We're quickly turning into Zimbabwe with snow.