This reminds me of something I read in an interview with Roger Penrose.
Q: The idea of parallel universes--many worlds--is a very human-centered idea, as if everything has to be understood from the perspective of what we can detect with our five senses.
A: The trouble is, what can you do with it? Nothing. You want a physical theory that describes the world that we see around us. That's what physics has always been: Explain what the world that we see does, and why or how it does it. Many worlds quantum mechanics doesn't do that. Either you accept it and try to make sense of it, which is what a lot of people do, or, like me, you say no--that's beyond the limits of what quantum mechanics can tell us. Which is, surprisingly, a very uncommon position to take. My own view is that quantum mechanics is not exactly right, and I think there's a lot of evidence for that. It's just not direct experimental evidence within the scope of current experiments.
Q: In general, the ideas in theoretical physics seem increasingly fantastical. Take string theory. All that talk about 11 dimensions or our universe's existing on a giant membrane seems surreal.
A: You're absolutely right. And in a certain sense, I blame quantum mechanics, because people say, "Well, quantum mechanics is so nonintuitive; if you believe that, you can believe anything that's nonｭintuitive." But, you see, quantum mechanics has a lot of experimental support, so you've got to go along with a lot of it. Whereas string theory has no experimental support.
Granted Hawkin & Hertog propose an experimental test to verify their theory. Which is at least somehting