All of which begs the question: do you think they would have been better off with the 27th century time period indicated by SoG, rather the the 23rd century that they ultimately went with?
In hindsight I think it might have worked out better. But then again, at the time we all assumed the lunar missions would immediately lead to a Mars expedition by the late 70s/ early 80s, then on to the asteriod belt by the 90s and so on. No one expected us to turn away from manned space exploration so quickly and so completely. It's kinda sad when you think about it.