The very nature of the multiverse “theory” precludes there ever being any evidence to support it. It’s a logical impossibility. That’s why it can never actually be a scientific theory, or a hypothesis, or even a postulate. It’s nothing more than philosophical speculation dressed up as science.
“The very nature of the multiverse “theory” precludes there ever being any evidence to support it.”
It’s also oxymoronic in the sense that the universe is everything that exists, which means that “multiverses” are part of our universe.
I see the multiverses as similar in kind to the theory of “dark” matter and “dark” energy. Scientists find a phenomenon that no current theory can explain, so they get busy concocting new substances to try to rescue their current model of how things work, rather than face the much more difficult challenge of coming up with a new model-and that’s understandable.
I have a suspicion that dark matter and energy and multiverses have more in common with phlogiston than with anything real.