Once you accept that there exists something isomorphic to a wave function, it's more like:

many worlds vs. many worlds and an orang-utan vs. many worlds and an apple tree vs. many worlds and a television vs. many worlds and a blue castle vs. (...) vs. many worlds and a character-of-natural-law-violating process that constantly kills all the worlds except one.

All cases except the last case contain many worlds, but Phil packed them together. I think that's the intuition Eliezer was getting at.