Maybe it’s more like an hour glass and we are on the matter side of the black hole with our universe filling up.
On the other side of the hourglass is the anti matter side that is also expanding to counter balance us.
It’s all a continuous flow of energy. Ever expanding, ever contracting...
I just read a Sci-Fi novel where Earth and another civilization in another universe were shifting matter between the two universes in order to have ‘unlimited’ ‘free’ energy........to a point.................