A Case Against The Multiverse?

The Multiverse is a theory that proposes that there are multiple Universes. I also have a theory. My theory is that there are multiples universes, but essentially they are one. Each Universe is connected to each other, and therefore each Universe is influenced by the other. Therefore, if this were to be true then we could consider the Multiverse just one Universe, not even a single universe within the multiverse is totally independent of the others, for at some time each Universe will be influenced in some way by all others, including ours.