Four groups can change.
Mr. Trump can decide that having consistently bad integrity means nobody beyond the paid staff pretends to believe him, and moreover nobody needs to even respond to his next insistent fabrication because he’s always useless as a source of information. You might as well stare at the fish tank for all it’s going to help you.
Trump’s Republican friends can decide that the Donald is a liability to them ever getting elected again, because if you approve of a horrid source of stupid rants, who on earth wants to trust what you say either? A loss of credibility is the end of all traction. This happened to the Confederate Dollar too in 1865. Nobody trusted it any more.
Third, much of Mr. Trump’s base, the ones that think for themselves a little, can just shut the junk off, at least they can in their minds. Some of us have had parents in the Alzheimer’s unit, and we listen to them but we don’t react to what they say.
Fourth, the press can finally get it. If one side sounds like a tiny death cult and the scientists line up on the other side, no newspaper of repute is required to give equal 50-50% credibility both to the tiny death cult versus the other side. Maybe the death cult is just loony and mean-spirited.