One reason would be that time stops when velocity rises to 'c'. An event that would occur in a fraction of a second, as for example the collapse of our universe into the black hole, cannot occur because time stops and so events get frozen for billions of years and we are just a tiny flash of a moment in this long period, now about 10,000 odd years of man on Earth. Will the universe collapse or expand into nothingness and dark energy now, in the century ahead of us?? Astronomers are studying Steve Hawkins data to find out. Will the "God Particle" wipe out our Universe in an instant? Will super-symmetry occur? Stephen Hawking offered only a theoretical doomsday scenario for the Higgs Boson.
Personally I do not believe the Hawkins scenario. I'd say that a shadow is present only if a real object does cast the shadow, and even if the two are super-symmetrical, the shadow cannot wipe out the real object. So, dark energy will not wipe out all known matter in our Universe.