/Doubt.
We are so far from experiencing these things our models are ridiculously extrapolative.
Why would gravitational collapse lead to supernova from a lead star? Why would gravity and density be equal throughout the life of a black dwarf? There are trillions of white dwarfs with more continuously being produced, would their expulsions not intact with each other?
After trillions and trillions (and and and and of course) would the cosmic expansion of the universe not have alleviated the density causing all cosmic pressures to be lessened?