@virginiaheffernan That was tried. HuffPost covered his primary campaign as "entertainment" rather than "news". It didn't work, because Trump was effective at engaging his base regardless of how mainstream media treated him.
And if he's not getting the coverage he needs to remain relevant, he will do something egregious to get it. So far, I would conclude that hoarding documents at Mar-a-Lago was a good move for him, because he has yet to be meaningfully punished for it, and it keeps him in the news.