Again, if it comes down to a choice between Weekend at Bernie's or an emergency Gavin Newsom campaign, the powers that be inside the democrat party will do what their constituents expect them to do: Find a way to put a potential winning candidate on the ballot.

There is no way to change the candidate. That's what I keep telling you.

You keep imagining that there's a "the powers that be" that has the ability to overrule Biden's choice to keep running. But there simply isn't, because the most powerful folks within the Democratic party right now are Biden and his allies. He's the President. He's the biggest "power that be" in the party. His faction is the dominant faction in the party. The rules are specifically set up to prevent the other factions in the party from being able to veto the primary nominating process, and if Biden is unwilling to withdraw from the race, there's no mechanism by which the other factions can change the rules to take the nomination away from him.

Again, in the pre-1968 days, the rules of the parties allowed the convention delegates and party poobahs to choose the nominee, and primaries weren't binding on their decisions. The modern rules require that the nomination be awarded to the person who wins the most delegates, and require the delegates to follow the results of the primary contests.

There's not some "behind the scenes" group of people that have the power to just overrule the results of the election to choose the party's nominee and take it away from Biden. That's just not the case.