The GOP congress are the ones with the real power and they're anything but unified. Trump is one of the worst presidents of all time but there have been monsters before and there inevitably will be again.
But a violent uprising is more beneficial to Trump than it is to us. The chances of a better system replacing the current one is basically zero without the majority of people willing to agree on what a better system looks like and how to organize it quickly without concessions, otherwise the USA will just become a corpse for the looming vultures to land on.