What Would Happen In A Scenario Where Joe Biden Passes On Before The Primary?

 Well.....things go to hell in a hand-basket.

You end up with VP Harris moving up....a selection process where a new VP is pursued, and has to pass through the Senate.  It's anyone's guess who Harris would select, but I'm guessing she would NOT select Governor Newsom.

President Harris would then enter the primary period, and likely find that there's not a lot of enthusiasm for her.  RFK would likely gain quickly some momentum and the general view would be that he's the only possible candidate at that point.

The ability of the news media to sell Harris and her 'brand'?  She'd have to clean up her poor speech problems, and present herself as some 'great' political figure (which would be difficult).

It's one of those amusing discussions that you've have in a bar after the third beer.  

Here's the odd factor....there beyond Joe Biden, there must be at least fifteen Senators/House members....in this age group, and I could see some 60-day period where you might have Biden and two or three 'old' folks pass on.   The media question....isn't it remarkable that so many old folks died?  And the response would be...yeah, why is that?