If(!) it turns out that when each quantum particle changes state, that it changes state to every possible new state (each state being in its own reality), then your #3 above must be the result. There is no other possibility, for just as each state is in its own reality, each new *combination* of states of every particle in the universe is in its own reality. Note the word “combination”, for that would also demand that if in the vanishingly-remote possibility that all particles changes state at the same time, the number of new realities created would be equal to X to the power of X-1, (‘X’ being the number of particles in the universe)…and this would repeat with every change of state in every reality subsequently created.

If this is the case, then the number of realities that must have been created since the Big Bang is the greatest practical numerical value of which a human mind can possibly conceive.

As a result, my brain hertz. Frequently.