Seeing is believing when it comes to reining in Trump.
Remember 'president' Bannon? (Not that anyone in their right mind wanted him in the job, but the accepted wisdom for a time was that he was playing Trump like a fiddle.)
The Rasputin-like figure that the Kush was made out to be for a while?
The same being said about a whole range of figures, including one now publicly humiliated Jefferson Beauregard Sessions?
My hypothesis is that you're good in your role as Trump's pupeteer-in-chief exactly as long as you don't annoy his majesty and no newer, more exciting guy comes along to steal your spot in the sun.