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Your point is a very valid one that I can honetsly say I've never thought about. We do have significant evidence for the theory that the universe is rapidly expanding and to this date the only explanation we have for it is "Dark Energy". WTF is dark energy?! Our best explanation is that some invisible thing that we have no idea about is ripping our universe apart!!!! I like your idea. Maybe there are many, many other universes outside of ours all exerting a gravitational force on our universe, thus ripping it apart from all sides nearly uniformly(but certainly not uniformly).
We seem to have come to some sort of a crossroads on our scientific exploration. We are getting more and more evidence by the year that everything may not be as it seems and we certainly have to be scepticul, but inquisitive. As we look at the history of our understanding of the material world, we have always been partially wrong erring on the side of hubris. At first the Earth was the center of the universe but we soon learned that it was the Earth that revolved around the Sun. So surely the Sun must be the center of the universe right? Well no, it's orbiting in the Milky Way around the center of the Universe, so pretty close still. Then Hubble figures out that one of the stars in the sky was an "island universe" and we pretty much figure out that the universe it terrifyingly large. So we arrive to our present day. As far as we know, our universe is the only one but if look at our past errors in estimating the size and age of the universe, it is very reasonable to assume there there is much out there that we just don't have the capabilities to see yet.
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