It seems to me that, as a practical matter, some sort of socialism or communism must emerge by default. If human society is no longer directed by the dictates of a supposed personal Creator, then another basis for common morality must be found. I think that would be service to the many, humanity as a whole. In addition, a reverence for life for those mystically inclined.
The ethical vacuum left by organized religion's decline will be filled somehow. This could even be precipitous if extraterrestrial life is discovered. The drift towards nihilism will not sustain our civilization for very long. It's too bad Startrek isn't around anymore because it got people to think about these future challenges.
