A Return to Walter Cronkite news?

In an essay about our growing partisan divide, Jon Haidt and Sam Abrams note:

American newspapers were quite partisan for most of history. But with the emergence of television in the post-war years, and with the popularity of newscasters such as Walter Cronkite, the nation had a few decades in which most Americans got the same news from the same few sources, particularly the three national television networks.

All that changed with the advent of cable television in the 1980s and the Internet in the 1990s. Now Americans can choose from hundreds of partisan news sources, many of which care more about arousing emotions than hewing to journalistic standards.

Is it possible this course reverses direction and media becomes consolidated again? Seems impossible, information is way too bottom up and widely accessible now.

But is it?

The big 4 (Amazon, Facebook, Google, and Apple) keep growing and swallowing up their competition. Jeff Bezos even owns the Washington Post. People regularly get their news from Facebook and Twitter, accessing it through Google Chrome on their iPhone.

I know, these are content aggregators and not content producers like NBC, ABC, and CBS. But what's to stop them from filtering content or eventually producing their own content?

We've already seen Alex Jones' Infowars get banned from pretty much every online platform. If the big 4 decide to ban unpopular messages, they can control the content to more palpable tastes. They might tone done dangerous rhetoric at the risk of drowning out important dissent.

I'm still not sure if this would be a good thing or not.