If by "erased" we mean every digital and physical copy goes poof, on the contrary, I think Jurassic Park is the first (hell, if forced, only) movie I save - Spielberg still operating at his peak, with a concept that hadn't been done to death, with CGI that almost entirely holds up a third of a century later.
I think I'd go with Groundhog Day next, as its a concept that spawned a million imitators, none of which have outdone the original.
For the third, The Fugitive, Tombstone, Schindler's List, Nightmare Before Christmas are all great films, but they all have replacement-level candidates... so Demolition Man wins for me, not because of its underrated action scenes, but because the setting is still fresh (and being referenced) all these years later.
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