The hope and appeal of MWI is that the Schrödinger equation is sufficient. What you describe is way beyond what may be found in it. "Many worlds" may arise nat

The hope and appeal of MWI is that the Schrödinger equation is sufficient. What you describe is way beyond what may be found in it. "Many worlds" may arise naturally from the Schrödinger equation in this way: if you measure a system, the components of its wavefunction decohere, so that they no longer interfere. These components may be intuitively understood as "worlds." We find ourselves in the world corresponding to the larger-measure component more often. But why? If your answer is "because more universes were created for larger measures," that is not found in the Schrödinger equation; it requires additional axioms, which is precisely what MWI hopes to avoid.