One person that you never seem to hear from is Mike Pence and he stands to gain an awful lot.
My guess is that when Trump begins to fall, he'll fall very quickly and very far. Pence surely knows that he probably won't win an election on his own so this is his only chance to become big chief. For Trump to go, it needs the Republicans to move against him; while they back him, he's safe.
So Pence's job is to arrange the dominoes so they all fall nicely in line...
There's also a fair chance that in a couple of years we'll look back fondly at that cartoon duck shaped man who burbled and gurgled to himself on twitter.