I’m all for it.
And the sort of security that one needs to live a very long time can only exist if we all value individual life #1, and individual liberty #2. And such values demand of us that we act responsibly in social and ecological contexts. Liberty thus defined is comes with deep responsibilities.
And there is the small issue that markets and money are not able to support universal abundance, which is a requirement for long term security. So we need to go beyond money and markets, and use fully automated systems to deliver the reasonable needs of everyone to everyone. And part of the responsibility that will come from that is restricting family sizes to one child in most cases.
So it gets complex, and it does seem to me to be both possible and desirable.