A Second (and Better) Enlightenment
Like some other respondents, I'm not particularly optimistic at the moment. Human civilization, however, seems to proceed in cycles overall, and I believe that we are due—even if not quickly enough for my tastes—for a new positive cycle. Every Golden Age—the flowering of reason and good—has been followed by a withering, a decay, a rotting, a descent into superstition, prejudice, greed (pick your own favorite ill); somehow, though, the seeds of the next pinnacle begin their growth and ascent, seemingly finding nourishment in the detritus left by the past. A particular civilization may end, but new ones rise to take its place. I'm optimistic that the current nadir in which we find ourselves (e.g., a world mostly heedless of ongoing genocides, global warming, poverty, etc…) or toward which we see ourselves heading will lead to a renaissance, a new enlightenment…a profound, global shift in the world view for the better.