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Quote from the link: http://math.ucr.edu/home/baez/physics/Relativity/BlackHoles/fall_in.html"A more physical sense in which it might be said that things take forever to fall in is provided by looking at the paths of emerging light rays. The event horizon is what, in relativity parlance, is called a "lightlike surface"; light rays can remain there. For an ideal Schwarzschild hole ... the horizon lasts forever, so the light can stay there without escaping. (If you wonder how this is reconciled with the fact that light has to travel at the constant speed c—well, the horizon is traveling at c! Relative speeds in GR are also only unambiguously defined locally, and if you're at the event horizon you are necessarily falling in; it comes at you at the speed of light.) "
If we now define the speed to close to 'c' it means that from the infalling observers perspective the rest of the universe would speed up, possibly even go to its entropic 'death of equality/heat bath' before you ever reach that singularity's center, maybe even at the event horizon.
That's the big question Either there is no debris that can reach the singularity under the universes existence, at least until the 'heat death'. That might then mean that there is no new black holes, only those created at some origin, or possibly that you can get a new black hole, as that is a compression of mass, but you can't feed it?
It's also a question if they even pass the event horizon, I guess? Because well past that they can be defined as belonging to the black hole, wherever they are.
This seems to be the simplest explanation, and the simplest may well be the best.