Has no viable alternatives. Get real.

No one insists the Democratic party has no viable alternatives.

What most people recognize is that none of the viable alternatives are running.

Displacing Joe Biden as the actual nominee is not an academic thought experiment. For someone to be the nominee instead of Biden, they actually have to run. They have to file paperwork and hire staff and raise money and start telling lots and lots of people that they are running for the 2024 nomination.

None are.

All of the viable alternatives are waiting for 2024, when it is guaranteed that there's an open seat for the nomination and the Presidency, rather than try to take on an incumbent in their own party.

All these posts where you identify someone you think would be a better nominee than Biden? They're not relevant, because those people have chosen not to run. If they choose not to run, they won't be the nominee.