A problem with Multiverse theory is Boltzman brains (I don’t know if I spelled that right). If there are many universes, chances are that you are just a brain floating in space with fake memories, since universes in which brains suddenly appear are more numerous than those with whole histories leading up to your existence.
I probably didn't explain that quite right.
RE: The MultiVerse Simply Explained - Part 4 of 5 (Or How To Bake Your Noodle In A Few Easy Steps)