[nemild]

It depends on what "diverse" means to you. I would say that Scientific American isn't the same as a partisan news channel.

But to the degree that an ad driven model and social media is the primary way news distribution happens, media incentives are monolithic for media organizations.

On a discursive note, if you are interested in media incentives, "All the News That's Fit to Sell" is a great book that goes into media incentives in previous eras. When the economies of scale for printing presses went up, media naturally became more centrist and less alarmist because a single paper had to appeal to a larger audience. It gives you a sense for the power of incentives in dictating what media is created/distributed.