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> Sure you could replace all the science with magic

Come on, in many so-called SciFi settings "science" does simply replace "magic": You need something impossible/improbable to happen? Science! You need someone who wields that awesome power? Scientist! (Obviously for balancing reasons he's bound to be clumsy, awkward and not in anyway able to compete with the young jock hero). Beard and/or silly hat welcome.

In most popular science fiction movies* science is just the local flavor of magic (think Star Wars since we're talking about it), and remains as unhinged as magic would be in a medieval fantasy setting. Which means it's trivial to switch universes, a simple search & replace could do it.

_{* Obviously there is also "hard" science fiction, which is different, but it's rather marginal and mostly ignored by the masses.}