It's not going to be an issue within the useful life of my uterus (plus it is scarred from an EMCS), but I am happy to give an offering at the end of my life that could save other lives or avoid disability e.g. the corneas preventing blindness and always had opted in.
In this experimental case, I understand that it was a sister's uterus involved. I have no objection to that. In the same way that I don't object to a living person choosing to donate a kidney to someone they love. That's very different to people being exploited as a resource.
I do object to a general societal view of women being used and in many societies, abused for breeding/ population policies. While infertility is deeply distressing, it is not life-limiting.
There are societies where unborn fetuses are cared for more than the health, wellbeing and dignity of their mothers, or even the children that they will shortly become. Women have been forcibly coerced into producing many or few children to meet the demands of their political or religious leaders in many societies. In many countries, including supposedly developed ones, women are denied abortions that can prevent death, difficult lifetimes of ill-health/ severe disability that are poorly supported by healthcare systems, or forced to bear the offspring of their abusers and rapists.
Women's rights to manage their reproductive health is fragile and must not be taken for granted.
Transplanting reproductive organs would be risky in terms of organ rejection, then risky again in terms of being able to function to create healthy babies. A transplant of reproductive organs is certainly no quick fix anyway.
I will remain on the organ donation register.
If it ever becomes a widespread issue, then my tired, old uterus can go to the grave with me anyway, and I will opt out of donating reproductive organs even though it's probably a moot point.