In-vitro gestation is probably not that far off technologically - we’re already very close with sheep (there was a very successful artificial womb experiment there) and the age of viability keeps getting lower. I hope that regulators are willing to take the leap to human trials so we can finally do away with pregnancy for those who want to avoid it but still want children.
I wouldn't be so optimistic for lab-grown humans. If we are going to be selecting for the best physiological characteristics, we will inevitably end up with a far more homogeneous species. That, apart from all the genetic restrictions the powers that be will create in such an environment.
I googled the word untenable and I misused it. I just meant bad. Pregnancy is sucks and has always sucked. Most of the world was shitting in its own drinking water supplies until recently - pretty bad. But we invented plumbing and fixed it. I think humanity should do the same thing but for pregnancy.
The poorest and hated folks would be the first to go to mars, (think of illegal immigrants in USA, both democrats and republicans might agree to give citizenship of their relatives if they volunteer to go to Mars) these people would eventually build their own civilization would be envy of earth.