The WB complaint is very serious. If Trump goes dowm, and Biden is discredited, the 2020 election will probably be Pence Vs Warren, and she would be a disaster.
The Nixon debacle started the same way, and by the end, his Republican support evaporated. I can just see all the Republicans in congress deserting the sinkng Trumpship.
Attacking Biden to divert attention from Trump's troubles is not wise.