Biden knows history and Senate. He will only resign when, like w/ Nixon, Senators will tell him they are going to vote to convict. A better question – whether any of the Secretaries – State, Defense or Military leaders or advisors will resign. Either, because their advice was so bad, or if their good advice was not followed.
Unfortunately, lack of public/media criticism of D- Presidents does not serve them well. With Trump, you would have seen people threating or actually resigning or being fired, when he disregarded their opinions. So, each of these disagreements was vetted through robust discussions. Even Obama
had Biden contradicting many of his decisions (killing Osama, staying in Afghanistan), forcing a discussion. With Biden, most of the discussions are happening after the disaster already happened.
Petraeus, McMaster, Bloomberg published in the last day. I don’t know whether they were quiet before, or were not quoted, or were trying to talk in private, but it is too late for a lot of innocent people.