"Good luck thought policing thousands upon thousands of journalists"

Except you're ignoring the fact that the corporate media already does that. It seems to work well enough, too. It helps that "journalists" are mostly a thing of the past with today's reporters often just doing the minimum to check things when they're not just repeating whatever the current fad is. That's extremely popular, too. Most stories are whatever people in target demographic are either what people want to say yes to or hate on. We're already there.