Crackpot mode activated!
Does that mean that the "computer" running our hologram might in fact be a black hole? A black hole whose mass is equal to the mass of the Universe. I understand that black holes spin very rapidly, causing the singularity to expand into a disk... might that be why galaxies are flying apart from each other, rather than collapsing together due to gravity?
I mean, if the black hole were not spinning, and dark energy was indeed switched off, then the Universe would eventually contract into an equally massive black hole. At which point, there would be nothing to distinguish the 'inner' black hole from the 'outer' one, they'd be the same singularity.
Sadly, this is probably a gross over-simplification.