Such a good post. Well written, with a lot of food for thought. Many cultures fear any change and progress (usually religion based..so based on nothing other than "it's been this way") and remain 'stuck' in that time period. Look at the extremists in the Middle East and their attitude towards women, for example.

I've never understood fear of knowledge to achieve a better way of life, but that's my personal opinion of what is a better way of life (happy, purposeful, and long/healthy). So, for me there is NO LINE. It doesn't matter what we think now about the future, because human thought is so malleable. Some day in the near future it'll be considered selfish to carry a fetus naturally as opposed to a safer option of an external womb. Can you imagine the verbal wars that will inevitably take place? And then it'll be accepted.