The thread discussion
has reminded me of a variation of the MWI a coworker explained to me about 15-20 years ago. I am wondering it anyone at PF knows of any publication that discusses anything like this variation. I tried to find one searching the Internet, but I had no luck.
Details of the MWI variation are below.
The multiple worlds are not real, but instead they are contingent. This mean that each of the various possible combinations of all of the possible future measurements or relevant interactions that change the probabilities, that could possibly happen according the wave function of everything, define one possible contingent world. When a measurement or relevant interaction occurs, the single real universe becomes constrained to have it's wave function of everything reconfigured to have new initial conditions consistent with the new measurement or interaction. The collection of all the contingent universes are also reduced to just those which are consistent with the new measurement or interaction and the revised initial conditions.