Biden is already on thin ice between the mishandled secret papers and his increasing senility. However taking laundered Chinese money with a phony teaching gig at U of Pennsylvania could force his resignation.
I do not believe there is any scandal that can force a Biden resignation. He will remain in office as long as the oligarchs who put him in office want him to stay. Or until he dies. That last option is not entirely under their control. The drugs they keep giving him so he can maintain public appearances must impose a terrible toll on his body. He could suffer a blowout at any time with little warning.
They have got to replace him before that happens.
Harris has turned out to be bad-tempered, disobedient, and possibly uncontrollable. That is what they really mean when they say she is "unelectable". They can still put her into office with enough election fraud, but it won't do them any good if she won't follow directions.
Something has changed. The "mainstream media" in the US are all owned by six corporations and those corporations have considerable overlap in their former directors. The media companies write the stories they are told to write and spike the stories they are told to spike.
They were writing very critical stories about Harris a few months ago. Now they are writing adverse stories about Joe Biden and Hunter Biden. That looks like a shift of faction alliances to me.