One different conclusion that derives from a previous answer would be the following.

If the universe is infinite enough to reach thermodynamic equilibrium then Boltzmann brains would largely surpass the number of biological brains, this is simply because entropy fluctuations will favor them (they would require a smaller, and thus more likely, departure from the black hole filled thermal/entropic equilibrium state).

But if the universe ends up in a big rip, big crunch, or whatever, then the universe would never live for an enough time to let these fluctuations appear (and then biological brains would be more likely than BB's).

Using the anthropic principle, this would suggest that the number of short lived universes in which their dynamical laws allow complex structures to appear relatively easily, might all be short lived.

One different conclusion that derives from a previous answer would be the following.

If the universe is infinite enough to reach thermodynamic equilibrium then Boltzmann brains would largely surpass the number of biological brains, this is simply because entropy fluctuations will favor them (they would require a smaller, and thus more likely, departure from the black hole filled thermal/entropic equilibrium state).

But if the universe ends up in a big rip, big crunch, or whatever, then the universe would never live for an enough time to let these fluctuations appear (and then biological brains would be more likely than BB's).

Using the anthropic principle, this would suggest that the number of universes in which their dynamical laws allow complex structures to appear relatively easily, might all be short lived.