I doubt it they would turn on him. What he actually does isnt important to them.... its what he says to them and how he attacks most everything outside of his personal bubble that truly matters to these kool-aid drinkers.
At this point, Trump isn't just lying to his cult, they are lying to themselves. They know full-well who he is and what hes about at this juncture, they are aware hes an incompetent, lying, viscous bungler who does not have the skills to succeed. They know hes not a self made man. They know that he screws them over almost every chance he gets. They know the price American prestige and influence has paid abroad during his regime.
They dont really care.
As I have stated before, its like modern professional wrestling fans...... he gives just enough "policy" rhetoric to allow his cultists an excuse for their continued support of a man who is diametrically opposed to the things they say they stand for, the morals and values they contend are important to them. He offers them occasional random policy words, not even complete thoughts or platforms actually, just barely enough jumbled political jargon/word salad so that his lemmings can tell themselves and the rest of the world that he actually understands what hes doing/saying/tweeting.
They realize that they are angry, bitter, & frightened people...... but they are also lazy, provocative and deceitful..... they yearn for conflict and have stopped searching for righteous causes to take up so they allow the red meat-rhetoric that Trump throws to them to satiate their lack of humanity.