I genuinely believe that the best case scenario for America is that it all goes to shit SO FAST that even his most ardent supporters have to say "No, this is fucked. He needs to go."
Republican propaganda outlets will tell them that there is no problem and they'll believe it. If not that, they'll tell them the problem is a fault of the "others", and they'll get even more on board the maga hate train. They're a lost cause.