To what end? Why all this theater to replace him at the 11th hour instead of just replacing him before he got to the point they couldn't hide it? You're seeing rats fleeing a sinking ship, not some elaborate conspiracy for the sake of a conspiracy.
Yup. After everyone in the country seeing 90 minutes of Biden all but drooling on himself there was no more hiding it, spinning it, nothing. They are jumping off that ship so fast the ocean levels are rising.