At first I wanted Biden to drop out because I thought the aftermath of the Dems scrambling to find a suitable replacement would be hilarious. But it's apparent in the last week that him staying in is far funnier.
You could get both: you could get the dems scrambling to find a suitable replacement while Biden begins to rally against the democratic party for ousting him. Biden giving old man speeches on like Tucker Carlson's twitter show or whatever.
It's also funny that after yelling at us for a year because we said Biden should drop out now that they agree they're incensed he isn't doing what they want immediatly.
When he loses he will almost certainly say something in his concession speech like "I have faith that President Trump will unite Americans and do what is best for this country, and I look forward to advising him if he needs me," even if this would be completely inappropriate to say, because Joe worships the religion of civility that much.