Than give me a single name of an alternative candidate, a real person that can replace Joe Biden on the ticket and beat Donald Trump? Then it will not be hypothetical.
Who do think could take the place of Joe Biden on the Democratic ticket without fracturing the Democratic party and handing the election to Donald Trump?
If you don't have a name of a real person... then this argument is meaningless. The Democrats are sticking with Joe Biden because they want to win the election. You can either get on board or not.