I've wondered if all the black holes will come together and form one giant black hole that will compress so tight something happens inside and bang, a new big bang happens and that's the cycle that takes place for ever. With infinite time it's hard to imagine nothingness will last for ever. more likely infinite universes in infinite cycles. but im not a science guy so probably completely wrong lol.
the big bounce theory? not likely... the distance seems too much to overcome. I'll never say never on that one though, simply because until we can see before the big bang we have no fucking clue. Heat death seems far more likely.
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(TITLE FROM REDDIT r/oddlyterrifying)