In the present day, mainstream journalists won't be meaningful advocates for democracy and the public interest any time soon. It's time to acknowledge that this idea is wishful thinking. The root cause is changes to the law like the Telecom Act of 1996 which allowed for the consolidation of old media under a few corporations.
For many years these mainstream journalists have been required to support corruption, cronyism, the centralization of power, and the increase of corporate power in order to retain their jobs. The law needs to be changed before they can become a net benefit to society again.