That's your error. The Dems will NEVER let Bernie get the nomination. Haven't you been paying attention? Every step since before Super Tuesday was for the expressed purpose of denying Sanders the nomination. He's the nonviable one.
Getting Biden to drop out will issue in the "Torricelli" candidate who will replace Joe after he's nominated so the replacement has no party unchallenger leading up to Election Day. Don't know if that's Hillary, Moochelle, Warren, Cuomo or somebody else but the Dems are going to pull the rug out from Biden somehow and hand the nomination to their cherry-picked replacement.
Remember what the Dems said during impeachment. "This election is too important to leave up to the voters."
It is just an example and wasn’t even my main point. My main point was to continue the story that has been going on the past month and see it to fruition. If it stops now and tries to start back up again 5 months from now that won’t be as effective.