I, and more than a few others, find the ongoing existence of multiple universes easier to swallow than the concept of new universes being created whenever a wave function collapses. The pre-existence of an infinity is of greater likelihood than the continuing creation of multiple infinities as time moves forward.

This is testable, if not practical atm. If something like an electron exists in ghost forms across multiple universes then they may be linked in those other universes more strongly than ours, a concept that may offer explanations for a variety of quantum behaviors. Proof of this would be the observation of a reliable link between particles not linked in our universe.