I’m normally critical of Biden but this is one of the few times I’ll say it. Biden staying in the race is the best thing he can do.
It doesn’t matter when he drops out at this point, the time to do that was 8 months ago. If he drops out now and there’s an open convention, democrats lose in November. If he drops out after the convention, and the DNC chooses a different candidate to replace him, Democrats lose in November.
The last time anything similar happened, there were riots outside the DNC in Chicago and Hubert Humphrey safely handed the office to Richard Nixon.