These a few problems with that. One is that you just figured out how the universe works without examining the the universe.
The argument that probabilities of past events are always 1 doesn’t prove anything objective, anything about the universe, unless you can show that probability always has to be interpreted objectively. As it happens there is also a subjective explanation for the rule.
Another is that it you can’t get MWI out if it...unless you regard it as a statement only about subjective probability
The probabilities or squared measures of the branches in MWI have to aim to 1. So you cant have more than one branch of probability 1.
The argument that probabilities of past events are always 1 doesn’t prove anything objective, anything about the universe, unless you can show that probability always has to be interpreted objectively. As it happens there is also a subjective explanation for the rule.
The probabilities or squared measures of the branches in MWI have to aim to 1. So you cant have more than one branch of probability 1.