Biden was only chosen as VP because he was too old to run for president after 8 years of Obama thus opening up the way for Hillary. He has always been a pawn in Hillary's plans. He will announce he has the virus and must drop out and Hillary will run claiming Biden is a martyr to Trump's failed virus defense.

Remember, the 2017 announcement that Superdelegates are gone was fake news, they are only gone from the first round of voting. Superdelegates count for 15% of the convention vote total. If Hillary can get 36% on her own she wins.