What does 'never' mean here. Do you literally mean that it can't happen even if human society progresses for another millenia? Or just that it won't happen in y

What does 'never' mean here. Do you literally mean that it can't happen even if human society progresses for another millenia? Or just that it won't happen in your career. The latter is somewhat plausible to me, but the former is only happening if there is a civilization ending catastrophe.