In fact, we wind up with the same sort of illusionism that saddled Boltzmann’s hypothesis. A small world with the illusion of a wider, orderly universe is more probable than a fine-tuned, real universe. Carried to its logical extreme, this has led to what theorists have called “the invasion of the Boltzmann brains.” For the most probable observable universe is one that consists of a single brain that pops into existence by a random fluctuation with illusory perceptions of the orderly cosmos! So if you accept the many worlds hypothesis, you’re obligated to believe that you are all that exists
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