I disagree.
Bernie is toxic. Socialism is a bad idea for many democrats as well as independents. It will motivate republicans.
Joe does the least damage as the designated loser despite being a horrible candidate as I have said repeatedly.
Pelosi wants to hold onto the house. Bernie is the most dangerous candidate for the DNC as a whole. If Bernie is at the top of the ticket it will be a bloodbath for them in middle America and in the south. Even some of their harvested seats in California will be up for grabs.
Joe is corrupt and senile. The party will take an bath anyway.