Many or most longtermists take artificial conscious minds seriously and as morally important, and there could be many orders of magnitude more of those in the future.
Also, even just with biological humans, we could dramatically lower the costs of having and raising children by making large parts of the process artificial, as you point out (artificial wombs, AI parents or no parents at all and more communal raising of children), allowing far more humans to exist.
Many or most longtermists take artificial conscious minds seriously and as morally important, and there could be many orders of magnitude more of those in the future.
Also, even just with biological humans, we could dramatically lower the costs of having and raising children by making large parts of the process artificial, as you point out (artificial wombs, AI parents or no parents at all and more communal raising of children), allowing far more humans to exist.